Punam Borah1, M. Optom Student;
Haziel Rynjah2, Assistant Professor
The Assam Royal Global University, Guwahati, India
The eyes are often called the “windows to the soul,” but scientifically, they may be much more than that. Beyond allowing us to see the world, our eyes, particularly the retina, can provide valuable clues about our overall health. The retina contains a complex network of blood vessels and nerve cells that can reflect changes occurring throughout the body.
The Retina: A Window to the Body
The retina is an internal movie screen of your mind, is a biological image sensor, a paper-thin, light-sensitive tissue lining the rear inner wall of the eyeball, acting as a canvas where the physical world is translated into the language of the mind. The tiny blood vessels of the retina tell us directly the story of our health. Changes in the retinal tree reveal associated systemic conditions, such as Diabetes, Hypertension, Cognitive Impairment, and Dementia. (1)
When the Retina Reveals More Than Vision
Modern research has indicated that changes in the retina may also provide clues about neurological and cardiovascular health. The retina and optic nerve are closely connected to the central nervous system; structural changes in layers of retinal nerves may reflect neurodegenerative processes. Retinal imaging has therefore attracted interest in conditions such as Alzheimer’s disease, Parkinson’s disease and multiple sclerosis. (2,3)
Figure 1: This flowchart shows the retinal indicators for systemic health conditions.
Technology That Reads the Story
Better eye imaging technologies have changed how clinicians see the retina. Optical Coherence Tomography (OCT) and fundus photography provide the structural and anatomical changes of the retina. OCT angiography can also visualise the retinal and choroidal microvasculature without the need to inject dye.
Artificial Intelligence (AI) is taking this to the next level. Deep-learning systems enable retinal photographs and OCT images to identify patterns associated with systemic health patterns and disease. This expanding field, termed “oculomics”, investigates how information hidden within the eye or retinal images may support future disease prediction and personalised healthcare. (4,5)
Conclusion
What your eyes are showing you could be a story far greater than what you are seeing. The retina provides a unique window into the health of the body. Retinal blood vessels, nerve fibres, and structural microscopic layers provide valuable clues about metabolic, neurodegenerative, and cardiovascular conditions. Advances in fundus photography, OCT, retinal imaging, and AI are not a replacement for standard medical diagnostics, but they are an impressive non-invasive source of health data that increases the potential of ocular biomarkers for early disease detection. As imaging technology and artificial intelligence continue to develop, an eye exam may evolve from a test of how we see to a glimpse of how we are doing.
References
- Kashani AH. Promises and pitfalls of retinal biomarkers in systemic health and disease. JAMA Ophthalmol. 2022;140(8):817-8.
- Vujosevic S, Parra MM, Hartnett ME, O’Toole L, Nuzzi A, Limoli C, et al. Optical coherence tomography as retinal imaging biomarker of neuroinflammation/neurodegeneration in systemic disorders in adults and children. Eye (Lond). 2023;37(2):203-19.
- Christinaki E, Kulenovic H, Hadoux X, Baldassini N, Van Eijgen J, De Groef L, et al. Retinal imaging biomarkers of neurodegenerative diseases. Clin Exp Optom. 2022;105(2):194-204.
- Wu JH, Liu TYA. Application of deep learning to retinal-image-based oculomics for evaluation of systemic health: a review. J Clin Med. 2023;12(1):152.
- Suh A, Ong J, Kamran SA, Waisberg E, Paladugu P, Zaman N, et al. Retina oculomics in neurodegenerative disease. Ann Biomed Eng. 2023;51(12):2708-21.
About the Author
Punam Borah
M. Optom Student,
The Assam Royal Global University, Assam, India
Haziel Rynjah
Assistant Professor,