1-Name the outer layer of the
eye. what is its function?
2-what is accommodation ?
3-what is meant by the
far point of eyes
4-Name the parts of human
eye that control the
amount of light entering
the eye?
5-state the causes of
myopia.
6- what is hypertreteropia?
Answers
1.The three main layers of the eye include: a) the cornea b) the uveal tract, and c) the retina. The cornea is the outermost layer of the eye and is made up of five layers of tissue itself. The cornea is clear, which allows light to enter through the pupil to shine on the retina.
2.Accommodation: In medicine, the ability of the eye to change its focus from distant to near objects (and vice versa). This process is achieved by the lens changing its shape. Accommodation is the adjustment of the optics of the eye to keep an object in focus on the retina as its distance from the eye varies.
3.In visual perception, the far point is the point at which an object must be placed along the optical axis of the eye for its image to be focused on the retina when the eye is not accommodating. It is sometimes described as the farthest point from the eye at which images are clear.
4.The parts are iris and pupil. Between the cornea and the lens we have a muscular coloured diaphragm called iris, which has a small hole in it, called the pupil. Iris is the coloured part that we see in the eye.
5.Myopia occurs when the eyeball is too long, relative to the focusing power of the cornea and lens of the eye. This causes light rays to focus at a point in front of the retina, rather than directly on its surface. ... In some cases, myopia occurs due to a combination of these factors.
6.Hypertropia is a condition of misalignment of the eyes (strabismus), whereby the visual axis of one eye is higher than the fellow fixating eye. Hypotropia is the similar condition, focus being on the eye with the visual axis lower than the fellow fixating eye.