Question

Briefly describe the structure of the eye.

Answer 1

Hint: Eyes are the major sensory organs of the animal visual system. They provide animals with vision/ sight, the ability to receive and process visual details, as well as enabling several photos, response functions, identification etc. that are independent of vision. So for these functions, there are so many organs or parts that are present in the eye, that are described briefly below.

Complete answer:

> Anterior Chamber-
 The anterior chamber rests behind your membrane however ahead of your lens and iris. It holds the body fluid and permits it to empty properly from your eyes into your blood.
> Aqueous Humor-
This thick fluid rests within the anterior chamber and provides nutrients to those 2 elements of your eyes. The liquid should drain frequently, and your body replaces it.
> Choroid-
This small, vascular layer sits between your eye's albuginea and tissue layer. It provides the outer layers of the tissue layer with nourishment (through blood vessels) and chemical elements.
> Ciliary Body-
This sits between your membrane and iris, and it produces body fluid and holds the lens in situ.
> Conjunctiva-
This clear membrane covers the white portion of your eye or the albuginea. The mucosa additionally covers the within of your eyelids. It produces secretion and tears to lubricate your eyes and keeps microbes out of your eyes.
> Cornea-
Your membrane may be a clear covering that rests over your pupil, iris, and anterior chamber. It provides most of your eye’s optical power. The membrane refracts light-weight and helps your eyes specialise in objects in your line of sight.
> Fovea-
The region may be a tiny depression in your tissue layer that contains cones to assist in correct seeing. If you have got issues with the region or the cones in it, you'll develop a foggy vision.
> Iris-
The iris is the coloured portion of your eye. it's created of a fibrovascular tissue referred to as the stroma. The stroma connects to a muscle that enables your pupils to contract and dilate.
> Lens-
This part of your eye may be a clear structure within your eye. It’s regarding the form of a lentil, and it will curve each inward and outward. just like the membrane, your lens refracts light-weight.
The lens controls in situ by a fibrous membrane referred to as the zone of Zinn or the patch ligaments of the lens.
If the lens has an associate degree irregular curve thereto, then you're doubtless to develop astigmatism. Another vision condition involving the lens is cataracts, wherever the lens becomes opaque or cloudy and impairs vision.
> Macula-
This part of your eye is about to the middle of your tissue layer. The macula permits you to visualize objects in nice detail. As you age, you'll develop devolution, a malady which will cause vision issues or result in vision loss.
> Optic Nerve-
This nerve carries electrical impulses from the rods and cones within the tissue layer to the visual area in your brain. If the cranial nerve is not present, your alternative eye parts cannot send pictures to your brain and turn out your sense of sight.
> Pupil-
Your pupil is the black circle within the centre of your iris. It regulates what proportion light-weight enters your eye. The pupil seems black as a result of this tissue absorbs most of the sunshine that passes through it.
> Retina-
Your tissue layer may be a sensory membrane that covers the whole back surface of your eye. once your lens picks up pictures, these pictures square measure sent to the tissue layer. The tissue layer then changes these pictures into signals that the cranial nerve then pulses to your brain.
> Sclera-
The albuginea is a lot of unremarkably referred to as the whites of your eyes. This fibrous layer contains albuminoids and protects the inner parts of your eye from injury.
> Vitreous Humor-
This clear, gelatinlike material sits between your lens and tissue layer. It additionally lines the rear of your eye. The vitreous body contains cells referred to as phagocytes that take away dust from your eye thus you don’t develop eye infections.

Note:
The human eye may be a paired receptor that reacts to lightweight and permits vision. Rod and cone cells within the tissue layer square measure photoreceptor cells that square measure ready to notice the light and convey this data to the brain. Eyes square measure organs of the sensory system.