Ch.2 Sections 4-5 Eye/Optics - Sci 7

An opening through which light enters the inside of the eye. In dim light it becomes larger to allow in more light. In bright light it becomes smaller to allow in less light.

• Cornea

• Pupil

• Iris

• Retina

A layer of cells that lines the inside of the eyeball made up of tiny light-sensitive cells.

• Cornea

• Pupil

• Iris

• Retina

Transparent front surface where light enters. It protects the eye and acts as a lens to help focus light rays.

• Cornea

• Pupil

• Iris

• Retina

A ring of muscles that contracts and expands to change the size of the pupil. It also gives the eye its color.

• Cornea

• Pupil

• Iris

• Retina

Light-sensitive cells that respond to color and detect red, green, and blue light.

• Iris

• Retina

• Rods

• Cones

These light-sensitive cells containing a pigment that respond to small amounts of light. They detect light, dark, and shades of gray.

• Iris

• Retina

• Rods

• Cones

This person can see distant objects clearly, but nearby objects are blurred. The eyeball is too short, so the lens focuses in back of the retina. This is corrected with the use of convex lens glasses.

• Iris

• Pupil

• Nearsighted

• Farsighted

This person can see nearby things clearly, but objects at a distance are blurred. The eyeball is too long, so the lens focuses in front of the retina. This is corrected with the use of concave lens glasses.

• Iris

• Pupil

• Nearsighted

• Farsighted

Gathers the light coming from an object and focuses the rays to form a real image.

• Iris

• Pupil

• Objective

• Eyepiece

The lens close to your eye that magnifies the image so you can see it clearly

• Iris

• Pupil

• Objective

• Eyepiece