SB2h: The Eye Keywords

Question 1

Cataract

Answer 1

Protein built up in the lens of the eye so that it becomes cloudy.

Question 2

Ciliary muscle

Answer 2

A muscle that relaxes or contracts to change the shape of the lens in the eye.

Question 3

Colour blindness.

Answer 3

An eye defect in which someone cannot see the full range of colours.

Question 4

Cone (cell)

Answer 4

A cell in the retina that detects different colours of light.

Question 5

Constrict

Answer 5

To make narrower.

Question 6

Cornea

Answer 6

The transparent front part of the eye, which covers the iris and pupil.

Question 7

Dilate

Answer 7

To make wider

Question 8

Iris

Answer 8

The coloured part of the eye. Muscles in it control the diameter of the pupil.

Question 9

Lens (biology)

Answer 9

Part of the eye that further converges light rays (which have been converged by the cornea) to focus them on the retina.

Question 10

Long-sightedness

Answer 10

An eye condition in which close objects appear blurred.

Question 11

Optic nerve

Answer 11

The nerve that takes impulses from the retina to the brain.

Question 12

Pupil

Answer 12

The hole in the front of the eye through which light can pass.

Question 13

Receptor cell

Answer 13

Cells that detect stimuli, such as cells in the eye that detect changes in light.

Question 14

Retina

Answer 14

The part at the back of the eye that changes energy transferred by light into nerve impulses. The retina contains rods and cones.

Question 15

Rod (cell)

Answer 15

A cell in the retina that detects low levels of light. It cannot detect different colours.

Question 16

Short-sightedness

Answer 16

An eye condition in which distant objects appear blurred.