Question

Photostress test to differentiate

• A. Lens and cornea
• B. The macula and Optic nerve diseases
• C. Cataract and glaucoma
• D. Retinal and vitreous diseases

Answer 1

The Correct Option is B

The photostress test is primarily used in the field of ophthalmology to help differentiate between diseases affecting different parts of the eye. The test involves exposing the eye to a bright light source for a specific duration and then measuring the time it takes for the vision to recover. This information is valuable in determining whether there are any underlying retinal or optic nerve issues.

In this context, the test is particularly effective in differentiating between macular and optic nerve diseases. This distinction is crucial because:

• Macular diseases: These affect the central part of the retina responsible for sharp, detailed vision. If the macula is compromised, recovery time after the photostress test is prolonged.
• Optic nerve diseases: These affect the nerve responsible for transmitting visual information from the retina to the brain. Typically, the photostress test recovery time remains closer to normal in optic nerve diseases.

Given the options, the photostress test is used to differentiate between macula and optic nerve diseases, as these conditions present distinct recovery times that can be assessed through the test.