Edisi Nota : Human Eye

1. The sense of sight is the sense that can detect light stimulus.

2. Structure of the human eye:

§  the sclera (outermost)

§  the choroids (middle) and

§  the retina (innermost)

1. The lens in the human eye is a transparent convex lens.

2. An inverted image is focused on the retina.

3. Light rays are refracted by the eye lens. The eye lens focuses the image onto the retina by changing the thickness of the eye lens. The thickness of the lens is changed by the ciliary muscles.

·        Focusing near objects.

§  To focus near objects onto the retina, the ciliary muscles contract. The eye lens become thicker.

·        Focusing distant object.

§  To focus distant objects onto the retina, the ciliary muscles relax. The eye lens becomes thinner.