scotoma

Areas in which scotoma will affect a student from being successful?

Scotoma is a localized defect in the visual field bordered by an area of the ordinary vision. A variety of eye diseases can cause scotoma including glaucoma and retinal diseases but also damage to the optical nerve.

A flashing line in eye is one of the phenomena called a scintillating scotoma (plural scotomata).

This spot is where the optic nerve and blood vesicles enter the eye and it is called the "optic disc".