[HA6] Eye see what you're seeing

Which structure of the eye causes the most refraction?

• lens

• aqueous humor

• cornea

• vitreous humor

Which structure of the eye protects it from mechanical damage?

When the eyes are exposed to dim light, what happens to the pupils?

Which structure of the eye allows it to rotate?

Which layer of the eyeball is sensitive to light?

• aqueous humor

• choroid

• retina

• vitreous humor

Which neurones are found in the optic nerve?

• sensory neurones

• relay neurones

• motor neurones

When looking at a far away object, the ciliary muscles in the eye ............., causing the suspensory ligaments to be ............, hence the lens becomes ........................

• relax taut, rounder

• relax, slacken, rounder

• contract, taut, longer

• contract, slacken, rounder

• relax, taut, longer

The fovea is the point on the retina where image formed is the sharpest. What is present in the highest concentration at the fovea?

• cones

• rods

The amount of light entering the eye is controlled by the ............. muscles. When the .............. muscles contract, the radial muscles .................., and the pupil becomes ................

• iris, radical, relax, bigger

• circular , ciliary, contract, smaller

• iris, circular, relax, constricted

• ciliary, iris, relax, constricted

When light rays converge on this point, no image is formed as there are no photoreceptors present.