Which statement best describes the use of OCT in ophthalmology?

Which statement best describes the use of OCT in ophthalmology?

• A. To evaluate the retina and optic nerve structure noninvasively.
• B. To measure corneal curvature in refraction testing.
• C. To replace slit-lamp examination.
• D. To assess intraocular pressure.

Answer: (A)

The main idea tested is what OCT is used for in eye care. Optical coherence tomography uses light to generate high-resolution, cross-sectional images of the retina and the optic nerve head. This lets clinicians see and measure the different retinal layers and the thickness of the nerve fiber layer noninvasively and quickly, which helps detect and monitor conditions like glaucoma, macular edema, diabetic retinopathy, and age-related macular degeneration. OCT isn’t used to measure corneal curvature—that’s keratometry—so it doesn’t replace devices used for refraction. It also doesn’t replace the slit-lamp exam; it complements the examination by providing structural detail of posterior segment tissues. And it doesn’t measure intraocular pressure—that’s the job of tonometry.

The main idea tested is what OCT is used for in eye care. Optical coherence tomography uses light to generate high-resolution, cross-sectional images of the retina and the optic nerve head. This lets clinicians see and measure the different retinal layers and the thickness of the nerve fiber layer noninvasively and quickly, which helps detect and monitor conditions like glaucoma, macular edema, diabetic retinopathy, and age-related macular degeneration.

OCT isn’t used to measure corneal curvature—that’s keratometry—so it doesn’t replace devices used for refraction. It also doesn’t replace the slit-lamp exam; it complements the examination by providing structural detail of posterior segment tissues. And it doesn’t measure intraocular pressure—that’s the job of tonometry.