(a) Draw a simple diagram of the human eye and label clearly the cornea, iris, pupil, ciliary muscles, eye-lens, retina, optic nerve and blind spot.
(b) Describe the working of the human eye with the help of the above diagram.
(c) How does the eye adjust itself to deal with light of varying intensity?
Answers
Answer:
Light rays enter the eye through the cornea, the clear front “window” of the eye. The cornea’s refractive power bends the light rays in such a way that they pass freely through the pupil the opening in the center of the iris through which light enters the eye.
The iris works like a shutter in a camera. It has the ability to enlarge and shrink, depending on how much light is entering the eye.
After passing through the iris, the light rays pass thru the eye’s natural crystalline lens. This clear, flexible structure works like the lens in a camera, shortening and lengthening its width in order to focus light rays properly.
Light rays pass through a dense, transparent gel-like substance, called the vitreous that fills the globe of the eyeball and helps the eye hold its spherical shape.
In a normal eye, the light rays come to a sharp focusing point on the retina. The retina functions much like the film in a camera. It is responsible for capturing all of the light rays, processing them into light impulses through millions of tiny nerve endings, then sending these light impulses through over a million nerve fibers to the optic nerve.
Because the keratoconus cornea is irregular and cone shaped, light rays enter the eye at different angles, and do not focus on one point the retina, but on many different points causing a blurred, distorted image.
In summary, the cornea is the clear, transparent front covering which admits light and begins the refractive process. It also keeps foreign particles from entering the eye.
The pupil is an adjustable opening that controls the intensity of light permitted to strike the lens. The lens focuses light through the vitreous humor, a clear gel-like substance that fills the back of the eye and supports the retina.
The retina receives the image that the cornea focuses through the eye’s internal lens and transforms this image into electrical impulses that are carried by the optic nerve to the brain. We can tolerate very large scars on our bodies with no concern except for our vanity. This is not so in the cornea. Even a minor scar or irregularity in the shape can impair vision. No matter how well the rest of the eye is functioning, if the cornea is scarred, clouded or distorted, vision will be affected.
In keratoconus, the irregular shape of the cornea does not allow it to do its job correctly, leading to distortion of the image it passed to the retina and transmitted to the brain.
THE CORNEA
The eye is enclosed by a tough white sac, the sclera. The cornea is the transparent window in this white sac which allows the objects you are looking at to be carried in the form of light waves into the interior of the eye.
The surface of the cornea is where light begins its journey into the eye. The cornea’s mission is to gather and focus visual images. Because it is out front, like the windshield of an automobile, it is subject to considerable abuse from the outside world.
The cornea is masterfully engineered so that only the most expensive manmade lenses can match its precision. The smoothness and shape of the cornea, as well as its transparency, is vitally important to the proper functioning of the eye. If either the surface smoothness or the clarity of the cornea suffers, vision will be disrupted.
CORNEAL LAYERS
Although appearing to be one clear membrane, the cornea is composed of five distinct layers of tissue, each with its own function.
Epithelium is the thin outermost layer of fast-growing and easily-regenerated cells.
Bowman’s layer consists of irregularly-arranged collagen fibers and protects the corneal stroma. It is 8 to 14 microns thick.
Stroma, the transparent middle and thickest layer of the cornea is made up of regularly-arranged collagen fibers and keratocytes (specialized cells that secrete the collagen and proteoglycans needed to maintain the clarity and curvature of the cornea)
Descemet’s membrane is a thin layer that serves as the modified basement membrane of the corneal endothelium.
Endothelium is a single layer of cells responsible for maintaining proper fluid balance between the aqueous and corneal stromal compartments keeping the cornea transparent.
Explanation:
MARK ME BRAINLIEST
Explanation:
(a) A simple diagram of the human eye is attached in the attachment.
(b) Human Eye Working:
- The light coming from an object goes through the cornea into the eye, a transparent substance.
- There's the iris behind the cornea, The pupil is a ring-shaped substance that has a hole in the centre.
- The light moves through the pupil and collapses onto the lens of the eye, which is a convex lens produced of material of an opaque, jelly type.
- The suspensive ligaments are mounted on one end of the eye lens and on the other end of the ciliary muscles.
- With the aid of light-sensitive cells the eye lens corresponds the light rays to create a true and distorted image of the target on the retina and produces electrical signals.
- Visual receptors do not exist at the intersection of the optic nerve and retina.
- This point is known as the blind spot A jelly-like, opaque substance called vitreous humor fills the gaps between the retina and eye lens, which promotes the back of the eye.
(c) The Iris sets regulations the light output entering the human eye by adapting the length of the pupil immediately according to the luminance received by the eye.
If the luminous intensity is high, the iris treaties the pupil to reduce the amount of light coming into the eye.
If the luminous intensity is low, the pupil will expand to let more light enter the eye.
