Deep research and expert guides on maintaining your visual health.
Introduction Eyesight is more than letters on a chart. While visual field testing is the gold standard for glaucoma and other eye diseases, patients often notice vision problems in day-to-day life before standard tests change. For example, people may struggle to read a book in low light or feel unsafe driving at night, even if their Snellen acuity or visual field is “normal.” In this article we...
Optical coherence tomography is a medical imaging technique that uses light to create detailed cross-sectional pictures of the eye. It works by sending low‑power light into the eye and measuring reflections from different layers to build a high-resolution image. The resulting views show thin slices of structures such as the retina, optic nerve, and cornea, allowing clinicians to see layer-by-layer detail. Because it captures microscopic structure, it reveals subtle changes that are not visible with routine exams or photos. The test is quick, noninvasive, and painless, usually performed in a clinic without special preparation. Optical coherence tomography matters because it helps doctors diagnose and monitor eye problems like glaucoma, macular degeneration, and diabetic eye disease earlier and more accurately. It provides precise measurements—such as the thickness of retinal layers—that make it easier to track small changes over time and to judge whether treatments are working. The images guide treatment decisions, for example when to start or adjust medications, perform laser treatment, or consider surgery. There are some limits: dense cataracts or poor fixation can reduce image quality, and the scans still need expert interpretation. Overall, it has transformed eye care by improving detection, follow-up, and personalized treatment plans.
