Above the eyelids are eyebrows, eyeballs in the eyelids, eyelids
on the upper and lower edges, and eyelashes on the edges of the eyelids. The
eyeball is composed of the iris and the sclera, and the center of the iris is
the pupil. The cornea is a transparent membrane that is attached to the
sclera. The iris is followed by a lens, the lens is attached to the thin
tendon, and the posterior is the vitreous.
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Definition of Ophthalmology |
Definition of
Ophthalmology
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Can be divided into the outer and middle triple membranes, and
the outer membrane is the cornea and sclera. The media is the iris, ciliary
body and choroid. The ciliary body is attached to the root of the iris and
has a ciliary muscle. The choroid is a structure that is rich in blood
vessels and pigments and is close to the retina. The retina is the
endometrium of the eye wall, which contains a large number of photoreceptors
and neural junction cells.
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The outer surface of
the eye sclera
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Definition of Ophthalmology, and
the inner surface of the eyelid are covered with a thin conjunctiva, and the
outer part of the eyeball is connected with small muscles. Behind the eyeball
is the optic nerve, which contains blood vessels that supply blood to the
eye.
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Light conversion
image
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·
When the external image enters the
eyeball through the pupil through the light, it stimulates the receptor cells
on the retina, and the cell transmits the photoelectric signal to the
surrounding connected cells. The processed nerve impulse is finally
transmitted to the visual center of the brain via the optic nerve to form a
map image.
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The pupils become
larger and smaller
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·
The size of the pupil is controlled
by the sphincters and open muscles in the iris. When the eye is exposed to
strong light, the sphincter will contract and the pupil will become smaller.
When the light is dim, the open muscles contract, causing the pupil to
enlarge.
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Eye movement
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The muscles of the eyeball are
attached to different directions of the eyeball. When the eye muscles of a
certain area contract, it will pull the eyeball to move in this direction.
Sometimes complex eye movements require more than two ocular muscles to
contract together.
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Common diseases of
the eye:
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1.
Floaters
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2.
Myopia
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3.
Acute glaucoma
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4.
Chronic glaucoma
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5.
Acute conjunctivitis
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6.
Chronic conjunctivitis
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7.
Retinal detachment
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8.
Corneal ulcer
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9.
Cataract
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10.
Aametropia
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11.
Night blindness
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12.
Perspective
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13.
Hyperopia
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14.
Presbyopia
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15.
Red-eye syndrome
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Common symptoms of
the eye :
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1.
Eye pain
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2.
Eye red
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3.
Photophobia
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4.
Visual disorders
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First aid Eye
injuries are:
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1.
Foreign body in the eyes
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2.
Chemicals eyes
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3.
Eye hit
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Prevention :
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Definition of Ophthalmology, attention
to eye hygiene is one of the most important ways to prevent eye diseases.
Don't let your eyes get too tired. Don't read in light places. Wear eye
protection when working under strong light. Don't abuse gauze to cover your
eyes or Use eye drops.
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