Seeing (tto-1)

The outermost membrane of the eye

• Sclera

• Choroid

• Retina

• Fovea

The innermost membrane of the eye

• Sclera

• Choroid

• Fovea

• Retina

This part of the retina has no rods or cones

• Fovea

• Choroid

• Blind spot

• Optic nerve

The spot in the retina right behind the pupil

• Fovea

• Pupil

• Blind spot

• Vitreous body

The middle membrane with blood vessels

• Sclera

• Choroid

• Cornea

• Retina

The transparant layer of the outermost membrane

• Sclera

• Cornea

• Choroid

• Retina

This produces tears

• Tear gland

• Tear duct

• Tear fluid

• Eyelashes

What are characteristics of cones?

• They work when there is plenty of light; with cones you see colours

• They work when there is plenty of light; with cones you see black, white and shades of grey

• They work when there is dim light; with cones you see colours

• They work when there is dim light; with cones you see black, white and shades of grey

In dim light.....

• The radial muscles contract, your pupil becomes smaller

• The radial muscles contract, your pupil becomes larger

• The circular muscles contract, your pupil becomes smaller

• The circular muscles contract, your pupil becomes smaller

When you look at an object far away, your lens will be ....

• Convex (round)

• Flat