GCSE AQA Biology- The Eye

GCSE AQA Biology- The Eye
Tough supporting wall of the eye - ✔✔✔Sclera



Transparent outer layer found at the front of the eye. Refracts (bends) light into the eye - ✔✔✔Cornea



Contains muscles that allow it to control the diameter of the Pupil (hole in the middle) and therefore
how much light enters the eye - ✔✔✔Iris



Focuses light onto the retina - ✔✔✔Lens



Contains receptor cells sensitive to light intensity and colour - ✔✔✔Retina



Controls the shape of the lens - ✔✔✔Ciliary Muscles and Suspensory Ligaments



Carries impulses from the receptors on the Retina to the Brain - ✔✔✔Optic Nerve



Pupil decreases in size as the circular muscles in the Iris contract and radial muscles relax - ✔✔✔
Adjusting To Bright Light



Pupil widens as the radial muscles in the Iris contract and the circular muscles relax - ✔✔✔Adjusting To
Dim Light



Ciliary muscles contract, meaning the suspensory ligaments slacken, causing the lens to fatten (curve)
increasing the amount by which it refracts light - ✔✔✔Focusing On Near Objects