BIOLOGY - UNIT 8: HUMAN ANATOMY AND PHYSIOLOGY SENSORY SYSTEMS: THE EYE

Difficulty with seeing objects close to the eye is called:

1. Farsightedness 2. Hyperopia

Difficulty with seeing distant objects is called:

1. Nearsightedness 2. Myopia

Light refracted aspherically

Astigmatism

Localized distortion of light through the cornea is called ______ .

Astigmatism

The axons of the retinal culminate in the optic nerve which forms a __________ spot on the retina.

Blind

Trouble distinguishing colors

Color Blindness

The photoreceptor cells which are sensitive to colors are called the __________.

Cones

The area of the eye with a concentration of cones is the:

Fovea

Eyeball too short

Hyperopia

Eyeball too long

Myopia

Vitamin A deficiency

Night Blindness

The retinal cells responsible for night vision are:

Rods

Off-center viewing of a dim object at night is helpful because:

The faint object will focus off the fovea

A light image formed on the retina is inverted.

True

Night blindness can be caused by a deficiency of:

Vitamin A