OCT is useful in diagnosing many eye conditions, including:

macular hole
macular pucker
macular oedema
age-related macular degeneration
glaucoma
central serous retinopathy
diabetic retinopathy
vitreous traction.
OCT is often used to evaluate disorders of the optic nerve as well. The OCT exam helps your ophthalmologist see changes to the fibres of the optic nerve. For example, it can detect changes caused by glaucoma.

OCT relies on light waves. It cannot be used with conditions that interfere with light passing through the eye. These conditions include dense cataracts or significant bleeding in the vitreous.