Sight - The Eye (Leaving Cert Biology): Flashcards

Thin membrane protecting the sclera

Transparent section allowing light to enter the eye

Rods detect black/white; cones detect colour

Central retina with only cones; sharpest vision & focus

Area with no rods or cones; no images detected

Carries impulses from eye to brain

Adjusts lens shape to focus on objects at varying distances

Controls amount of light entering the eye

Contracts to reduce light entering eye

Dilates to allow more light to enter eye

See distant objects clearly, not near objects

Convex lens

See near objects clearly, not distant objects

Concave lens

Process of changing the focus of the eye