Form 5 - The Eye and Vision

What is the "blind spot"?

• helps to focus light on the retina

• transparent, watery fluid that supports and shapes the front of the eye

• area where no light falls on the eye

• area of the eye that is NOT sensitive to light

What is the conjunctiva?

• coloured ring of muscle that controls the amount of light entering the eye

• a thin, transparent membrane that protects the surface of the eye from dust and particulates

• helps to focus light onto the retina

• attaches the ciliary muscles to the eyeball

What is the sclera?

• tough, white layer that surrounds and protects the eyeball

• transparent jelly-like substance that supports and shapes the back of the eyeball

• move the eye in its socket

• hole in the centre of the iris through which light enters the eye

Rods are densely packed in the middle of the retina and are sensitive to red/blue/green colours

• TRUE

• FALSE

What is presbyopia?

• far-sightedness

• age-related loss of accommodation

• overproduction of fluid in the eye

• near-sightedness

How is glaucoma corrected?

• laser treatment

• specialised eyedrops

• surgery to increase drainage

• bifocal lens

• all of the above

What kind of lens is used to correct hypermetropia?

• Concave lens

• Bifocal lens

• Convex lens

• Diverging lens

What is glaucoma?

• increased pressure in the front of the eye due to blocked or altered flow of aqueous humor

• the eyeball is too long, or the lens is too thick, so images focus IN FRONT of the retina

• age-related loss of accommodation

• the eyeball is too short, or the lens is too thin, so images focus BEHIND the retina

Define the fovea.

• an area on the retina with a high concentration of ROD cells

• a hole in the centre of the iris

• sees best in low light

• an area on the retina with a high concentration of CONE cells

What are cone cells?

• tough white layer that surrounds and protects the eye

• spread out at the edges of the retina and see well in low light

• the orange things they put in the street

• packed in the middle of the retina and see colour