Skip to main content

Featured Post

Cornea Of The Eye

Cornea Of The Eye Cornea Definition 10-foods-highest-in-iron. The cornea is the unmistakable front surface of the eye. It lies straightforwardly before the iris and student, and it permits light to enter the eye. Seen from the front of the eye, the cornea shows up marginally more extensive than it is tall. This is on the grounds that the sclera (the "white" of the eye) somewhat covers the top and lower part of the front cornea. The level distance across of the cornea normally gauges around 12 millimeters (mm), and the upward breadth is 11 mm, when seen from the front. However, whenever saw from behind, the cornea seems roundabout, with a uniform measurement of around 11.7 mm. This makes the cornea around 66% the size of a dime. The middle thickness of the normal cornea is around 550 microns, or somewhat the greater part a millimeter. The cornea has five layers. From front to back, these layers are: The corneal epithelium.  This external layer of the cornea is five to se...
Post a Comment

Conjunctiva Of The Eye



Conjunctiva Of The Eye

Definition of conjunctivaThe conjunctiva is a thin transparent membrane that covers part of the front surface of the eye and the inner surface of the eyelids. It has two tranches:

Bulbar conjunctiva.
This part of the conjunctiva covers the front part of the sclera, the "white" of the eye. The bulbar conjunctiva terminates at the junction between the sclera and the cornea; it does not cover the cornea.lid conjunctiva.
This part covers the inner surface of the upper and lower eyelids.The bulbar and palpebral conjunctiva are continuous (see figure). This feature prevents you from losing your contact lens (or whatever) behind your eye.conjunctival functionThe basic functions of the conjunctiva are:
  • Keep the front part of the eye moist and lubricated.
  • Keep the inner surface of the eyelids moist and moisturized so they open and close easily without rubbing or irritating the eyes.
  • Protect your eyes from dust, pollution and infectious microorganisms.

The conjunctiva has many small blood vessels that supply nutrients to the eye and eyelids. It also contains special cells that secrete a component of the tear film to help prevent dry eye syndrome.conjunctival problemsA number of conditions can affect the conjunctiva. Some of the more common conjunctival problems are:conjunctivitis.Also called conjunctivitis, this is conjunctivitis. It can have several causes.

Pale conjunctiva.

This is an unhealthy, pale appearance of the lid conjunctiva that may be a sign of anemia.Injected conjunctiva.It is redness of the eye caused by dilation of the conjunctival blood vessels. It can have many causes.conjunctival cyst.This is a thin-walled, transparent sac in the conjunctiva that contains a clear fluid. It looks like a small transparent bubble on the skin.A cyst or conjunctival sac can occur as a result of an eye infection, inflammation, or another cause.conjunctival hemorrhage.

This is bleeding from a small blood vessel in the front of the eye, above the sclera. As the leaking blood spreads under the conjunctiva, the whites of the eye appear bright red. More specifically known as subconjunctival hemorrhage, this type of red eye is harmless and usually goes away on its own within a few weeks.conjunctival lymphoma.

This is a tumor on the front of the eye that usually appears as a salmon pink "fleshy" patch. Conjunctival lymphomas are usually hidden behind the eyelids and are painless; As such, they can be present for a long time before they're discovered, especially in people who don't get routine comprehensive eye exams. If you have a growth on your eye that looks like this description of conjunctival lymphoma, see an eye doctor right away who can evaluate it and possibly do a biopsy to determine appropriate treatment.hemangioma of the conjunctiva.

This is a benign (noncancerous) tumor of small blood vessels that forms a red, blood-filled sac in the conjunctiva. Large conjunctival hemangiomas can be surgically removed if they cause irritation.conjunctival birthmark.This is a common and benign growth of the bulbar conjunctiva. In fact, conjunctival birthmarks (plural of nevus) are the most common growth found on the surface of the eye.

A conjunctival birthmark can range in color from yellow to dark brown and may darken or lighten over time. In most cases, a conjunctival birthmark doesn't need treatment, but if the birthmark gets larger, it can be surgically removed.conjunctival melanoma.This is a raised, dark, or relatively prominent carcinoid growth in the bulbar conjunctiva. Italian-chicken-and-penne.
Conjunctival melanomas are rare but potentially fatal.Conjunctival melanoma cancer cells can infiltrate the eyeball and spread to the lungs, liver, brain, and bones via the lymphatic system or bloodstreamto the lungs, liver, brain and bones.

Conjunctiva Of The Eye. VIDEO







Labels:

Comments

Post a Comment

Popular posts from this blog

Cornea Of The Eye

Cornea Of The Eye Cornea Definition 10-foods-highest-in-iron. The cornea is the unmistakable front surface of the eye. It lies straightforwardly before the iris and student, and it permits light to enter the eye. Seen from the front of the eye, the cornea shows up marginally more extensive than it is tall. This is on the grounds that the sclera (the "white" of the eye) somewhat covers the top and lower part of the front cornea. The level distance across of the cornea normally gauges around 12 millimeters (mm), and the upward breadth is 11 mm, when seen from the front. However, whenever saw from behind, the cornea seems roundabout, with a uniform measurement of around 11.7 mm. This makes the cornea around 66% the size of a dime. The middle thickness of the normal cornea is around 550 microns, or somewhat the greater part a millimeter. The cornea has five layers. From front to back, these layers are: The corneal epithelium.  This external layer of the cornea is five to se...
Post a Comment
Read more

The Retina: Where Vision Begins

The Retina: Where Vision Begins Retina Definition 11-healthy-foods-that-are-very-high-in. The retina is the sensitive layer that covers the inner surface of the back of the eye. It consists of several layers, with one layer containing specialized cells known as photoreceptors.  The natural eye contains two types of photoreceptor cells - rods and cones.  Rod photoreceptors detect motion, provide high-contrast vision, and function effectively in dim lighting. Cones are responsible for central vision and color perception, functioning optimally in moderate to bright lighting.  Rods are distributed throughout the retina; cones are concentrated in a small central area of the retina known as the macula. At the center of the macula lies a small depression known as the fovea. The fovea has only cone photoreceptors and is the area in the retina responsible for maximum visual clarity and color perception.  Retinal Function  Photoreceptor cells capture light focused b...
Post a Comment
Read more

Pupil: Aperture Of The Eye

Pupil: Aperture Of The Eye The pupil of the eye is indeed analogous to an aperture in an optical system. It is the circular opening in the iris that allows light to enter the eye. The iris, the colored part of the eye, controls the size of the pupil, acting as a diaphragm to regulate the amount of light entering. When the pupil dilates (widens), it allows more light to enter, and when it constricts (narrows), it allows less light in.  Here's a more detailed explanation: Aperture and Light: Just like a camera's aperture, the pupil controls the amount of light reaching the light-sensitive part of the eye, the retina.  Iris as Diaphragm: The iris, with its muscles, expands or contracts the pupil, adjusting its size based on ambient light levels.  Pupil Size and Vision: In bright light, the pupil constricts, providing a sharper image with greater depth of field (everything in focus). In low light, the pupil dilates, allowing more light to enter for better vision in the ...
Post a Comment
Read more