Question

Name one defect of vision which cannot be corrected by type of lenses...not spectacle lenses

Answer 1

One defect of vision that cannot be corrected by any type of lenses or spectacle lenses is cataract. It can only be treated by surgery.

Cataract diminishes eyesight as a cloud appears in the lens of the eye in this vision impairment.

The only way to treat cataract is to replace the natural lens in the eye with an artificial lens with the help of surgical excision.