Introduction to Artificial Intelligence in Ophthalmology

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Definition

Artificial Intelligence (AI), a term introduced in the 1950s, refers to software that can mimic cognitive functions such as learning and problem solving.[1] It makes it possible for machines to learn from experience and adjust to new inputs. AI machines can be trained to accomplish such tasks by processing and recognizing patterns in large amounts of data.[1] It has numerous applications in several fields of ophthalmology.[2]

Types of Artificial Intelligence

Simple Automated Detectors

A simple automated detector is a system that is fed an algorithm that identifies the presence or absence of features (e.g. location, dimensions, or contour of a lesion) based on objective criteria. The input into the system is a set of step-wise rules generated by the individuals who are engineering a model that predicts outcomes.[3] This rule-based algorithm assesses features and ultimately yields an outcome (e.g. diagnosis) based on the patterns identified.[3]The rules are generally written by programmers or content experts using input features that they have previously identified as being important.

Machine Learning

A more advanced form of AI is machine learning. Unlike simple automated detectors, the input into machine learning is a training dataset (e.g. a set of images) rather than predefined algorithms (i.e. rules written by the program designers).[4] Machine learning can be further classified into supervised, semi-supervised, and unsupervised learning.[4] In unsupervised learning, the machine must “learn” on its own the different labels or classes of inputs based on the dataset presented. The machine learning process can be assisted by providing the machine with objective guidance through a labeled dataset and is the basis for supervised learning.[4] A labeled dataset, for example, is a collection of images that have been preassigned a “ground truth” diagnosis by experts who utilized standard diagnostic methods. A consensus amongst experts on a reference standard diagnosis for each item (e.g. image) in the set may strengthen the quality of the dataset that is presented to the machine during the initial learning phase when the algorithms are built.[5] Presenting an machine learning system with a hybrid of both training and labeled datasets is termed semi-supervised learning.[4] See Figure 1.

Figure 1. Machine Learning

Machine Learning Techniques

Machine learning models can employ various techniques to predict an output. Classification is one technique that is built upon supervised and semi-supervised learning.[4] This type of system allows for concrete categorization of outputs (e.g. presence versus absence of disease; mild versus severe category of disease).[4] When classes or labels for the training data are not provided, unsupervised machine learning is still able to cluster similar inputs, even if it is not able to definitively classify the individual clusters.[4] When ordinal or continuous outcomes are desired rather than a simple classification, regression techniques can employ supervised learning to determine a continuous score (e.g. numerical value) based on an input (e.g. image).[4]

The architecture of machine learning models can employ neural networks (to be discussed next) in addition to other techniques such as genetic programming, support vector machines, statistical regression, tree-based classification & regression, or random forests.

Utilizing Neural Networks in Machine Learning

An AI system designed using artificial neural networks (ANNs) is considered a subset of machine learning and can be used in both supervised, semi-supervised, and unsupervised learning. The architecture of an ANN is composed of layers of neurons. An ANN consists of an input layer that is introduced with (e.g. diagnostic) features determined by programmers and subject matter experts in advance, intermediate neural network layers, and a final output layer that receives the analysis from the intermediate layer and determines the outcome (e.g. diagnosis).[3][4] A layer refers to the level at which analysis of one set of distinct (e.g. diagnostic) features are conducted. Each layer is composed of multiple neurons, or nodes, that perform the higher level analytical processing, initially described as emulating the neuronal functions of the brain.

Each node can be considered a basic calculation of the multiple inputs including multiplication of an individual input by an assigned “weight”, addition of a bias, and a (non-linear) mathematical activation function which enables more complex analysis. The result of a each node in one layer is then transmitted to multiple nodes in the next layer where further computations occur. At the output layer in the neural network, the resulting number approximates a continuous measurement (i.e. a regression prediction) or the probability of an outcome or classification. Each item (e.g. image) in the dataset is usually analyzed multiple times during training using back-propagation to update the network's weights and biases to maximize the performance of the model's predictions. See Figure 2 for visualization of this process (and comparison to Deep Learning described below).

Figure 2. Machine learning vs deep learning neural networks

Deep Learning

In a simple neural network, there are only a few layers: as few as just an input and output layer. However, deep learning algorithms are neural networks with an expanded number of communicating layers between the input and output layers: from dozens to hundreds. This intricate type of machine learning involves supervised learning with labeled datasets (e.g. images with preassigned expert diagnoses). See Figure 3 for a flow diagram of this relationship.

Figure 3. Flow diagram of Artificial Intelligence

One popular form of deep learning neural network is the convolutional neural network (CNN). Other deep learning models include recurrent neural networks, Long Short Term Memories (LSTMs), and fully-connected deep neural networks.

The CNN begins with a large matrix of inputs into the first layer (often a 2D image), which then results in an output that serves as the input for the next layer in the series. The connections between layers describe a convolution propagating local information (where the weights and biases of the convolution are shared between all nodes of a layer to dramatically reduce the parameter space of the model and thus the complexity of training the model). The analysis from each layer is transmitted throughout the network until the final layer produces the outcome.[4] CNNs designed for image-based diagnosis, for example, analyze the pixels in correlation with the features seen in the disease state depicted.[3] If the predicted outcome does not match the expert outcome determined using standard methods, then errors in the prediction are propagated backwards through the CNN to adjust the weights to reduce the error. After training, the model is presented with a training dataset (e.g. unlabeled images) and produces an outcome (e.g. diagnosis) based on what the machine “learned” under supervision. See Figure 2 for visualization of this process in comparison to Machine Learning as described above.

While the training dataset can provide an initial analysis, it is important to ensure that the algorithm is generalizable to new datasets.  This is accomplished with appropriate control during training and verified using validation datasets, which minimize “overfitting” the algorithm to the training dataset. Techniques to minimize overfitting include dataset expansion, augmentation, applying drop out, and regularization. Augmentation can be utilized in examples where the original dataset cannot be expanded. For example, images can be altered (resizing, cropping, rotating, etc) in such a way that they still represent realistic examples. Drop out can be used to train the algorithm by ignoring a certain subset of nodes, training other nodes to perform the work of others. Regularization involves altering the total of all weights in the system. The final step is to evaluate the model’s performance on a new dataset that it has not been exposed to.[4]

Limitations of Artificial Intelligence

As a quickly evolving field, AI comes with some challenges. For one, the accuracy of outcomes is heavily dependent on the quality of inputs.[6] This has been described as the “garbage in, garbage out” phenomenon; if the initial dataset presented to the machine is inadequate, then the predictions generated by the AI tool will be inaccurate. In some situations, output recommendations by AI tools may be simply incorrect. For example, IBM Watson Health’s AI algorithm, which predicts treatments for patients with cancer, recommended the use of bevacizumab in patients with severe bleeding.[6] However, hemorrhage is stated as a black box warning for bevacizumab. This example highlights the importance of training and validating AI algorithms.[5]

Erroneous predictions by AI algorithms can bring up the issue of liability for physicians. Current law protects physicians from liability, as long as they follow the standard of care.[7] Thus, physicians are incentivized to use AI predictions only if they confirm existing decision-making processes, instead of as a resource to improve and build upon patient care.[8] In the future, further medicolegal implications must be considered if AI becomes integrated into the standard of care.

Additionally, NN algorithms are not entirely designed by programmers, but by rules inferred from the training dataset. They arrive to conclusions opaquely as programmers are unaware of the reasoning behind these self-generated rules. This is called the black box dilemma, as people may be hesitant to trust predictions that stem from a process that, by definition, lacks transparency.[9] Additionally, biases and stereotypes inherent in the training dataset become integrated into the model's performance.[10]

There is a fear that AI reduces the need for physicians, as numerous studies have shown that certain algorithms have higher success rates of diagnosing diseases as compared to those of clinicians.[11][12] This has been a concern in image-based fields such as radiology and pathology, with concerns that it may limit physicians by narrowing the scope of their clinical judgment, reducing a reliance on broad differential diagnoses, and automating the process of patient care which may affect that patient-physician relationship. By predicting diagnoses in a purely algorithmic and objective manner, AI dismisses any subjective facets of a disease that may be unique to a patient, potentially overlooking crucial information.[13]

However, it can be argued that AI merely augments the work of physicians by serving as a diagnostic tool generating predictions that can positively affect patient management.[3] For example, an AI-integrated telemedicine platform designed to screen and refer patients with cataracts exhibited diagnostic performance of over 90%. More importantly, the platform improved physician efficiency by allowing them to evaluate ten times as many patients a year.[14] By complementing the role of physicians, AI has the potential to significantly improve patient care by increasing efficiency and outcomes as it becomes incorporated into clinical practice in the near future.

Method to Approaching Artificial Intelligence Studies

Al is rapidly involving in the field of ophthalmology and new experimental algorithms are emerging in the literature that describe the AI system and methodology. Articles regarding AI studies can be challenging to understand, especially when there is no standardized way of presenting data, statistics and clinical value. Nevertheless, there are fundamental characteristics that readers can look for in order to critically appraise such studies. In the introduction, articles will typically emphasize the clinical gap that AI may fulfill and the research question it seeks to answer. Additionally, the introduction usually summarizes a thorough literature search that explores existing technologies pertaining to the disease and discusses the potential for AI to build on these technologies to provide further insight.[5]

In the methods section, articles will elaborate on the basic framework of an AI system, which consists of two phases: (1) training and validation and (2) testing. The training and validation phase can be further broken down into two other parts: (1) selection of a machine learning model; and (2) a training dataset entailing data and/or images.[5] Datasets may vary in sample size and may be limited in diversity or generalizability. As mentioned previously, the ease with which machine learning models can enshrine biases implicit in the data and the opaqueness of the reasoning behind their conclusions makes the selection of training data of fundamental importance. An article's method section should describe the source of the training data sets and the data's characteristics (diversity, gender, disease severity range, ages, etc.). All training steps should be described including the machine learning model upon which the study is based (including the source of any pre-trained weights if only transfer learning is performed), the versions of software used, and where source code for the model training can be obtained.

Moreover, AI studies should clearly describe the workflow for use of the AI system. For example, the workflow may consist of an input, such as an image, which is then analyzed by the AI system to detect specific features and ultimately produce an outcome, a diagnosis. The resulting diagnosis may complement the work of physicians, demonstrating the potential for reported AI systems to be ultimately incorporated into clinical practice.

As described by Ting et al., AI articles should generally include limitations of the AI systems discussed. This gives readers a clearer understanding of the potential for integration of AI into clinical practice and of the associated shortcomings of such systems.[5]

Potential Applications of Artificial Intelligence in Ophthalmology[2]

The incorporation of AI systems into clinical practice can potentially enhance productivity in the workplace, as well as aid in the clinical decision-making or patient communication processes.[15] [16]Applying AI to medical diagnostic assessments allows for the automatic analysis of imaging, for example, and the subsequent generation of a diagnosis or prediction of a disease course.[3][15] In ophthalmology, many AI platforms are being explored for potential use in the detection, surveillance, and treatment of various ocular diseases. However, many are in the experimental phase and further evaluation must be done to assess if these algorithms are appropriate for clinical practice.[17] AI algorithms have been described in the literature in several fields in ophthalmology such as diabetic retinopathy, glaucoma, age-related macular degeneration, retinopathy of prematurity, retinal vascular occlusions, keratoconus, cataract, refractive errors, retinal detachment, squint, and ocular cancers. It is also useful for intraocular lens power calculation, planning squint surgeries, and planning intravitreal anti-vascular endothelial growth factor injections. In addition, AI can detect cognitive impairment, dementia, Alzheimer's disease, stroke risk, and so on from fundus photographs and optical coherence tomography.[2]

Glaucoma

Multiple deep learning programs have demonstrated high sensitivity and specificity in recognizing glaucomatous optic nerve changes.[1][17][18] These AI readings are based on diagnostic features otherwise typically assessed by a human expert, including OCT and color fundus photography findings, visual field-testing results, and intraocular pressure and corneal thickness measurements. In addition to these AI systems that screen for the presence or absence of glaucoma, Muhammad et al. developed a deep learning algorithm that accurately identifies glaucoma suspects, allowing for more timely management.[19] An expanded discussion of the applications of AI in the field of glaucoma can be found in the article “Artificial Intelligence in Glaucoma.

Ocular Oncology

Emulating a decision tree model, a machine learning algorithm was developed to anticipate the course of periocular reconstruction during surgical treatment of basal cell carcinoma.[18]Moreover, several machine learning systems, through the use of artificial neural networks, have been designed to predict disease outcomes for choroidal melanoma by analyzing demographic data and oncologic history.[1]Habibalahi et al. implemented machine learning techniques in the development of a multispectral imaging system for the detection of ocular surface squamous neoplasia on biopsy[20]. The system demarcates the region of neoplastic changes, providing a visual representation of disease margins to the clinician or surgeon in minimal time.[20]

Cataracts

Machine learning programs have been developed to detect and grade cataracts.[18][21] [22] Wu et al recently validated a model using an AI algorithm called ResNet to identify referable cataracts.[23] Deep learning algorithms for the assessment of congenital cataracts in particular have also been reported.[1][24] A validated system by Liu et al, known as the CC-Cruiser, demonstrated high accuracy for identifying the region, density, and degree of congenital cataract formation based on slit-lamp photographs.[24]Machine learning systems for cataracts have also been shown to adequately guide plans for surgical intervention, as well as anticipate the likelihood of posterior capsular opacification developing post-operatively.[1][18][25]Calculating intraocular lens power can be conducted through machine learning methods.[18] One notable example is the Hill-RBF formula that analyzes the following inputted data: axial length, central corneal thickness, anterior chamber depth, lens thickness, corneal diameter, and keratometry measurements.[18]

Pediatric Ophthalmology

In the pediatric population, timely ocular management is critical for the preservation of vision. Incorporation of AI into screening and treatment practices may aid in achieving optimal ophthalmic care A deep learning algorithm for the assessment of strabismus from external images has been developed with the potential for implementation in tele-ophthalmology.  Other systems to detect strabismus are based on eye tracking deviations or retinal birefringence scanning.[26] [27] Other machine learning systems have the potential to facilitate screening for high myopia among other refractive errors, as well as classify children susceptible to reading disabilities.[28]Van Eenwyk et al describes a system using machine learning that incorporates the Brückner pupil red reflex imaging and eccentric photorefraction to detect amblyogenic features of strabismus or high refractive errors.[29] AI systems for congenital cataracts are discussed above in the “Cataract” section.

Retina

AI has been utilized in diabetic retinopathy (DR), retinopathy of prematurity (ROP) and age-related macular degeneration (AMD). The IDx-DR system was the first autonomous FDA approved system for DR screening.[30] Since then, the EyeArt system [31] [32] and the AEYE-DS[33] systems have been FDA approved for DR screening. All of these systems have high sensitivity an high enough specificity for utility in DR screening. In addition, comparison of the AI system to clinicians has shown the AI system to have higher sensitivity.[32] Other applications exist that can identify severity of DR and clinically significant macular edema.[34] [35]In ROP, AI tools such as the i-ROP DL system can distinguish features such as plus disease and is comparable or better than expert diagnosis.[36] In AMD, AI can be used to identify the difference between non-exudative and exudative AMD.[37]  The development of AI for AMD screening has inherent challenges, which the Collaborative Communities in Ocular Imaging (CCOI group is working to overcome.[38] An expanded discussion of the applications of AI in the field of retina can be found in the article “Artificial Intelligence in Retina.”

Oculoplastics

In oculoplastics, AI has the potential to aid in automated processing and measurement of patients’ facial dimensions to aid in pre- and post-op evaluations, as well as clinical decision support for oculoplastic referral by non-ophthalmologists. Semantic segmentation networks have been trained to automate periorbital measurements with comparable performance to human graders[39]. Hung et al. applied similar technology to training a model to aid general practitioners in decision making regarding referral of patients with blepharoptosis, which was shown to outperform the sensitivity and specificity of referral decisions made by non-ophthalmic physicians.[39] Simsek et al. developed an AI algorithm to objectively assess patients’ progress post-eyelid surgery in a standardized and repeatable manner [40].

Ethical Considerations of Artificial Intelligence in Ophthalmology

The use of AI in ophthalmology raises a number of ethical concerns that need to be carefully considered to ensure that it is used for the benefit of all. As AI continues to advance in ophthalmology, a thoughtful and ethical approach is indispensable. Balancing the promise of improved diagnostics and treatment with the responsibility to address ethical concerns is paramount.[41] Establishing and adhering to ethical guidelines ensures that AI in ophthalmology contributes positively to patient care while upholding the highest standards of ethical conduct.[42]

Data Privacy and Security

AI systems rely extensively on vast datasets, often comprising sensitive patient information such as medical histories, diagnostic images, and treatment records. Ensuring the ethical collection, storage, and utilization of this data are fundamental to safeguarding patient privacy and confidentiality.[43] Ethical frameworks must be established to govern the entire data lifecycle, from acquisition to disposal, with strict adherence to privacy regulations and standards.[44] Robust data governance protocols, including encryption, access controls, and anonymization techniques, should be implemented to mitigate the risks of unauthorized access, data breaches, and potential misuse of sensitive health information.[44] Moreover, healthcare institutions must prioritize continuous monitoring, auditing, and compliance verification to uphold the highest standards of data privacy and security in AI-driven ophthalmic practices.[45]

The ethical imperative of data privacy and security in AI implementation extends beyond mere regulatory compliance; it reflects a commitment to patient trust, autonomy, and well-being. Transparency regarding data practices and policies is essential to foster patient confidence and engagement in AI-enabled healthcare.[43] Clinicians and researchers must prioritize patient education and informed consent regarding the collection, storage, and utilization of their health data for AI applications.[46] By upholding ethical principles of transparency, accountability, and patient-centered care, healthcare stakeholders can ensure that the integration of AI in ophthalmology respects and protects patient privacy rights while harnessing the potential of data-driven innovations to improve clinical outcomes and quality of care.

Algorithmic Bias

Algorithmic bias presents a significant ethical challenge in the development and deployment of AI algorithms in ophthalmology. When trained on biased datasets, AI algorithms have the potential to perpetuate and exacerbate existing disparities, particularly concerning patient outcomes and access to care.[47] The ethical implications of algorithmic bias extend beyond individual patients to encompass broader societal implications, including the reinforcement of systemic inequalities. To address these concerns, ethical deployment of AI requires vigilant efforts to detect, mitigate, and prevent algorithmic bias throughout the algorithm development lifecycle.[48] This involves comprehensive data screening processes to identify and mitigate biases inherent in training datasets, as well as ongoing monitoring and evaluation of algorithm performance across diverse patient populations.[49]

Furthermore, ethical AI development mandates the integration of fairness, equity, and diversity considerations into algorithm design and validation processes. Collaborative efforts between clinicians, data scientists, and ethicists are essential to develop AI algorithms that are sensitive to the diverse needs and characteristics of patient populations.[46] Strategies such as algorithmic transparency, interpretability, and explainability can enhance accountability and trust in AI-driven decision-making processes, allowing clinicians and patients to better understand and evaluate the rationale behind algorithmic recommendations.[47] By prioritizing ethical principles of fairness and inclusivity, stakeholders can mitigate the risks of algorithmic bias in AI-driven ophthalmology and promote more equitable and patient-centered healthcare practices.

Transparency and Explainability

The complexity of AI systems utilized in ophthalmology often results in a lack of transparency and explainability, posing significant ethical challenges. Both clinicians and patients may struggle to comprehend how AI systems reach specific decisions, which can undermine trust and accountability.[50] To address this issue, efforts should focus on enhancing the transparency and explainability of AI algorithms.

One approach to improving transparency is through the development of interpretable AI models. These models are designed to provide insights into the decision-making process of AI algorithms, making it easier for clinicians and patients to understand how predictions are generated.[51] Techniques such as feature visualization, attention mechanisms, and model-agnostic interpretability methods can help elucidate the factors influencing AI predictions.

Furthermore, clear communication about the functioning of AI systems is essential for maintaining confidence in their application. Clinicians should receive training on how to interpret and critically evaluate AI-generated recommendations, ensuring they can effectively incorporate AI insights into their decision-making process.[51] Patients should also be informed about the role of AI in their care and provided with explanations regarding how AI recommendations are generated and utilized.

Human Role in Decision-Making

While AI offers opportunities for increased efficiency and precision in ophthalmology, it should not replace the essential role of human judgment. Human ophthalmologists possess unique skills, expertise, and intuition that are indispensable in clinical decision-making. Therefore, maintaining the central role of human ophthalmologists is crucial to ensuring ethical and responsible AI use.[52]

AI should be viewed as a complementary tool that augments human capabilities rather than supplants them. Human ophthalmologists can leverage AI-generated insights to enhance their diagnostic accuracy, streamline workflows, and optimize treatment plans.[53] By integrating AI into clinical practice in this manner, healthcare providers can capitalize on the strengths of both human and artificial intelligence to deliver the highest quality of care to patients.

Additionally, emphasizing the human touch in patient care is essential for preserving empathy, compassion, and ethical considerations. While AI may excel in data analysis and pattern recognition, it lacks the ability to empathize with patients or consider the broader ethical implications of clinical decisions. Human ophthalmologists play a critical role in addressing these aspects of patient care, ensuring that ethical considerations remain at the forefront of decision-making processes.[52]

Equity and Access to Care

Ethical AI deployment in ophthalmology requires a commitment to equitable access to advanced technologies. One of the primary ethical imperatives in AI deployment in ophthalmology is to address socioeconomic disparities in access to care. Without intervention, there is a risk that AI technologies may primarily benefit affluent populations, exacerbating existing healthcare disparities. Ethical deployment requires proactive measures to ensure that AI-driven ophthalmic care is accessible to individuals across all socioeconomic strata. This might involve implementing subsidies or financial assistance programs to make AI-enabled services more affordable for low-income patients. Additionally, initiatives to integrate AI technology into public healthcare systems can help ensure equitable access for underserved populations. [49]

Ethical considerations also extend to geographical accessibility, particularly for individuals residing in rural or remote areas where access to specialized healthcare services may be limited. AI deployment in ophthalmology should prioritize initiatives aimed at bridging the rural-urban healthcare divide.[54] This could involve deploying mobile clinics equipped with AI diagnostic tools to reach underserved communities, as well as leveraging telemedicine platforms to connect patients with remote ophthalmic specialists. By ensuring that AI-driven care is accessible beyond urban centers, healthcare providers can uphold ethical principles of fairness and inclusivity. Careful consideration must be given to the potential impact of AI on different socioeconomic groups and geographical locations. Initiatives should be undertaken to minimize disparities in access, making AI-driven ophthalmic care accessible and affordable to all.

Future directions

The advent of AI may reshape the field of medicine. There is unprecedented potential for AI to expand scientific inquiry by using neural networks to generate hypotheses and make new discoveries. It is however, extremely important to ensure the generative AI models are accurate and reliable which requires rigorous testing of large data sets. The field of AI in health care also requires a governance and evaluation framework to minimize risks due to fake data analyses.

With rapid analysis of vast amounts of data, AI can explore associations between disease features that may not be readily apparent to humans. There is potential for AI to enhance physicians’ abilities to diagnosis conditions earlier and more accurately. Ultimately, AI has the potential to assist physicians by individualizing medical management, exposing patients to therapy only when the clinical judgement of the physician is supported by the results of deep learning.[3]

Looking beyond solely utilizing AI in clinical practice, machine learning methods may play a role in guiding research investigations that aim to identify disease features newly discovered through automated techniques.[3]On a global level, the application of AI to existing tele-ophthalmology programs may facilitate outreach to underserved regions, addressing the shortage of specialists available to provide their expertise.[1]    

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