1. what is the most sensitive part of retina ?

2.the phenomenon due to which we can judge depth ?

3.the part of eyes which preserves its shspe and protects it from external injury is ..........................

please answer me fast ...........................

MACULA - This part of the retina is the most sensitive. Its diameter is only 7 mm or about 1/4 inch. It is responsible for our central, or reading vision. This part of the retina gives us 20/20 vision. Without the macula, you would be blind - Legally Blind that is. People with eye diseases like Macular Degeneration have vision from 20/200 to 20/800This part of the retina is the most sensitive. Its diameter is only 7 mm or about 1/4 inch.

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Depth perception is the visual ability to perceive the world in three dimensions (3D) and the distance of an object. Depth sensation is the corresponding term for animals, since although it is known that animals can sense the distance of an object  it is not known whether they "perceive" it in the same subjective way that humans do.[1]

Depth perception arises from a variety of depth cues. These are typically classified into binocularcues that require input from both eyes and monocular cues that require the input from just one eye.[2] Binocular cues include stereopsis, yielding depth from binocular vision through exploitation of parallax. Monocular cues include size: distant objects subtend smaller visual angles than near objects.[3]

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The eyes possess many protective structures and defenses.

The eye sits in a protective bony cavity called the orbit. The eyebrows, lids, lashes, a blink reflex and tears are all mechanisms that help to reduce damage to the eye from external injuries.

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