The superior oblique rotates the eye inward around the long axis of the eye front to back. The superior oblique also moves the eye downward. The inferior oblique is an extraocular muscle that arises in the front of the orbit near the nose. It then travels outward and backward in the orbit before attaching to the bottom part of the eyeball. It rotates the eye outward along the long axis of the eye front to back. The inferior oblique also moves the eye upward.
The conjunctiva is a transparent mucous membrane that covers the inner surface of the eyelids and the surface of the eye. When it is inflamed or infected it becomes red or pink. The lacrimal gland produces tears that lubricate the eye. It is located under the outer edge of the eyebrow in the orbit. The sclera is the white outer wall of the eye.
It covers nearly the entire surface of the eyeball. It is a strong layer made of collagen fibers. The tendons of the six extraocular muscles attach to the sclera. The cornea is the front clear part of the eye in the front center part of the outer wall of the eye.
It is made of collagen fibers in a very special arrangement so that the cornea is clear. Through the cornea you can see the iris and pupil. The cornea bends light coming into the eye so that it is focused on the retina. The cornea is the part of the eye on which contact lenses are placed.
The anterior chamber is a fluid aqueous humor filled space inside the eye. The cornea lies in front of the anterior chamber, and the iris and the pupil are behind it. The iris is the colored part of the eye. It is disc shaped with a hole in the middle the pupil. Muscles in the iris cause the pupil to constrict in bright light and to dilate in dim light. The change in pupil size regulates the amount of light that reaches the posterior back part of the eye.
The lens of the eye is located directly behind the pupil. The lens bends light coming into the eye to help focus it on the retina. It changes shape to help the eye focus to see objects clearly at near. The lens is suspended from the wall of the eye by many small fibers zonules that attach to its capsule. The ciliary body is attached to the outer edge of the iris near the wall of the eye. The ciliary body produces the fluid aqueous humor that fills the eye and nourishes its structures.
The doctor will then draw the letter H in the air because the two parallel lines of this character will test the superior and inferior rectus.
Opposite to the superior rectus, this muscle moves the eyeball downward. The motor function of the inferior rectus is supplied by the oculomotor nerve. This muscle is characterized by its fusiform appearance. When the eye is turned toward the nose, the inferior oblique muscle raises the eye, turning the top of it away from the nose and moving it upward. In an extraocular muscle function exam, your eye care specialist will observe the movement of the eyes in six different directions.
In some types of constant or even intermittent eye turns strabismus , early surgery may be prescribed by an eye surgeon to increase the chance of returning or developing normal binocular vision. Eye alignment surgery can restore normal appearance and is recognized as reconstructive surgery.
There are many other benefits beyond restoring a normal appearance. Improved depth perception or complete reattainment of binocular vision , improved visual fields, eliminating or reducing double vision and improved social experiences since eye contact is hugely important in human communication and emotional responses.
It is essential to discuss the goals and expectations of the surgery with an ophthalmologist. During strabismus surgery, one or more of the eye muscles are moved to improve eye alignment.
Strabismus surgery is usually performed as an outpatient procedure and does not require an overnight hospital stay.
Image: Extraocular muscles. Over Vivid Vision Providers prescribe virtual reality alongside patching and vision therapy to treat your lazy eye. Sign up through our doctor locator to see if Vivid Vision is right for you.
Eye Muscles There are six extraocular muscles that control all of the movement of the eye. What do the Eye Muscles Look Like? Superior Rectus The superior rectus inserts at the anterior front portion of the eye, and its origin is behind the eye on the common ring tendon.
Inferior Rectus The inferior rectus inserts at the anterior front portion of the eye, and its origin is behind the eye on the common ring tendon. Lateral Rectus The lateral rectus inserts at the anterior front portion of the eye, and its origin is behind the eye on the greater wing of the sphenoid bone as well as the common ring tendon.
Medial Rectus The medial rectus inserts at the anterior front portion of the eye, and its origin is behind the eye on the common ring tendon. Superior Oblique The superior oblique is unique. Inferior Oblique The inferior oblique is also.
How are the Eye Muscles Controlled?
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