Eye Care Glossary - V

A B C D E F G H I K L M N O P R S T U V

Glossary V

VERTEX DISTANCE: The distance (in mm) from the apex of the cornea, to the posterior surface of the spectacle lens or trial lens.

VISUAL ACUITY: The capacity of the eye for seeing distinctly the details of an object at a specific distance.

VITREOUS HUMOUR: Clear, colourless fluid, similar to raw egg white in consistency, which fills the space in the eye between the crystalline lens and the retina.