What does OCT stand for and what is it used for in ophthalmology?

What does OCT stand for and what is it used for in ophthalmology?

• A. Optical Color Transmission; used for color matching
• B. Optical Chromatic Tomography; used for measuring eye color
• C. Optical Coherence Tomography; provides high-resolution cross-sectional images of retinal layers and the optic nerve
• D. Optical Coherence Transmission; used for fundus photography

Answer: (C)

Optical Coherence Tomography provides high-resolution cross-sectional images of retinal layers and the optic nerve. It uses light in a way similar to ultrasound, measuring how backscattered light returns from different depths to build a depth-resolved image with micrometer-scale detail. This lets clinicians see the distinct retinal layers and detect thinning, swelling, or other structural changes that indicate disease. OCT is especially valuable for glaucoma assessment (nerve fiber layer thickness), macular diseases (edema, degeneration), and monitoring retinal or optic nerve conditions over time. Other terms in the choices describe color properties or 2D fundus views, which don’t capture the depth-resolved, cross-sectional information that OCT provides.

Optical Coherence Tomography provides high-resolution cross-sectional images of retinal layers and the optic nerve. It uses light in a way similar to ultrasound, measuring how backscattered light returns from different depths to build a depth-resolved image with micrometer-scale detail. This lets clinicians see the distinct retinal layers and detect thinning, swelling, or other structural changes that indicate disease. OCT is especially valuable for glaucoma assessment (nerve fiber layer thickness), macular diseases (edema, degeneration), and monitoring retinal or optic nerve conditions over time. Other terms in the choices describe color properties or 2D fundus views, which don’t capture the depth-resolved, cross-sectional information that OCT provides.