Three events occur to bring the image into focus on the reti

Three events occur to bring the image into focus on the retina: accommodation, pupil constriction, and convergence. Test your knowledge about these events by answering these questions.

True or False:

1. Accommodation is a result of parasympathetic stimulation from the optic nerve (I). TrueFalse
2. In accommodation, the lens becomes more spherical in shape. TrueFalse
3. One reason accommodation becomes more difficult as an object is brought closer to the eye is because the lens cannot become any more flattened. TrueFalse
4. When we look at a close-up object, the pupil diameter decreases. TrueFalse
5. When the pupil is constricted, the light entering the eye tends to pass through the center of the lens rather than through the edges of the lens. TrueFalse
6. The smaller the pupil diameter, the more light enters the eye and is directed toward the retina. TrueFalse
7. Both pupils can pick up the light rays when the eyes are looking forward. TrueFalse
8. Convergence states that eyes are rotated medially as an object moves closer. TrueFalse
9. In convergence, rotation of the eyes is accomplished by the medial oblique muscles. TrueFalse
10. An observer can see convergence by watching the medial rotation of the eyes of the subject when bringing an object toward the nose. TrueFalse

Solution

1. True.

Accommodation reflex is caused by focusing a near object then looking at distant object. The shape of the Lens is controlled by ciliary muscles inside the eye. This reflex is controlled by parasympathetic nervous system.

2. False. During accommodation the tension on equatorial zonules is increased so the anterior and posterior zonules are simultaneously relaxed this increase in the tension keeps the lens stable and their flatten peripheral lens surface.

3. When the eye is viewing farther object the ciliart muscles relax and pull on the suspensory ligaments which in Turn pull lens capsule this causes the lens to flatten or become less convex enabling the lens to focus light from the father object when the eye is viewing nearer object accommodative demand is created due to this lens become conbex.

4. True.

The pupils get smaller in brighter light conditions as well when we concentrate on closer objects.

5. True

The Pupil allows the light to strike retina. It will dilate if a person sees near object. The constrivtion of pupile and the near vision aura very closely related.

6. False.

In dim light The Pupil expands to allowlot more light to enter the eye

7.true

In Binocular vision it is possible. Humans have maximum horizontal field of view with 2 Eyes

8.true

Locate an object Closer by the eyes rotated towards Each Other which is called convergence

9.true.

Six extraocular muscles facilitate a moment. Public muscles are a primer really responsible for torsional movements

10. True

When the eyes adducted that is towards the nose the oblique muscles are the Prime Vertical movers.