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Anonymous users2024-02-07The contents of the eye include aqueous humor, lens, and vitreous. The external light is refracted through the cornea and the transparent contents, focused on the retina of the fundus, and then converted into nerve impulses through the photosensitive transposition of the optic cells, which are transmitted to the visual center of the brain through the optic nerve and optic duct to produce vision.
The atrium is a space between the cornea and the lens that contains aqueous humor. The lens is a biconvex elastic hyaline body, the back is more convex than the front, located between the iris and the vitreous, and there is no blood vessel and nerve distribution. The lens is enclosed by the lens capsule, which is transparent and elastic.
The vitreous body is a transparent and colorless gelatinous body that fills between the lens and the retina, and the vitreous occupies 4 5 of the inner cavity of the eyeball.
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Anonymous users2024-02-06The contents of the eyeball include: aqueous humor, lens and vitreous, the human eye is approximately spherical, and the eyeball also includes the wall of the eyeball, the contents, nerves, blood vessels and other tissues.
The atrium is a space between the cornea and the lens, containing aqueous humor, which is divided by the iris into a larger anterior chamber (between the cornea and the iris) and a smaller posterior chamber (between the iris and the lens), the anterior and posterior chambers communicate through the pupil, and the annular area at the junction of the iris and the cornea is the iris corneal angle or anterior chamber angle.
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Anonymous users2024-02-05The wall of the eyeball is divided into three layers, the outer layer is the fibrous membrane, the middle layer is the uvea, and the inner layer is the retina.
The contents of the eye include three transparent media, aqueous humor, lens and vitreous, which are the pathways for light to enter the eye and reach the retina, and they are called the refractive medium of the eye together with the cornea.
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Anonymous users2024-02-04Fibrous membranes, uvea and retina. Lens vitreous.
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Anonymous users2024-02-03Outer, middle, inner. Aqueous humor, lens, and vitreous.
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Anonymous users2024-02-02The wall of the eye consists of three layers: the outer, the medial, and the endometrium.
1. The outer membrane is composed of dense connective tissue, also known as the fibrous membrane, which plays a role in supporting and protecting the eyeball wall and its contents, and the first 1 6 is called the cornea, which is a transparent membrane with a dense surface, and its curvature is greater than that of other parts of the eyeball wall in the Rotten Spring, and has a refractive effect. There are no blood vessels in the cornea, but there are a large number of sensory nerve endings distributed, and the sense of pain and touch is extremely sensitive, so there is often severe pain when inflammation.
The posterior 5 6 is called the sclera, which is milky white and opaque, and the front end of the sclera is deep with the corneal continuum part, and there is an annular venous sinus, called the scleral venous sinus, and the posterior end is at the optic nerve penetration site, and the sclera is wrapped around the optic nerve to form the optic nerve sheath.
2. The middle membrane is rich in dusty vascular plexus and pigment cells, so it is also called vascular membrane or pigment cell. The median membrane is divided into three parts: the iris, the ciliary body, and the choroid.
3. The inner membrane is the retina, which is lined with the inner surface of the middle membrane and can be divided into two layers. The outer layer is the pigment part, which is composed of a single layer of pigment epithelium; The inner layer is the nerve part, and according to the structure and lining parts of the school, it is divided into the optic part (located in the posterior 2 and 3 parts), the ciliary body and the iris part. Among them, only the visual part has the function of light sensitivity, and the other two parts cannot be sensitive, which is called the blind part.
The two layers of the retina detach from each other in certain diseases, called retinal detachment.
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Anonymous users2024-02-01The eyeball wall is divided into three layers:
1.Adventitia (fibrous membrane): This is the outer layer of the eyeball wall.
2.Media (pigmented, vascular, or uveal): The median membrane is the choroid, ciliary body, and iris from back to front.
3.Intima (retina): It can be divided into iris, ciliary body, and optic parts.
The first is to quit smoking and drinking, and try not to expose your eyes to strong light. >>>More
The first type of nystagmus should be understood through the eye tracker and the two indicators of movement and sensation should be used to determine whether to operate or not, exclude acquired nystagmus, exclude the acquired nystagmus that cannot be operated, and evaluate whether the operation has room to improve vision through eye trackers and various professional examinations. For example, if the concave fixation time is too long, surgery is not recommended, and surgery is not recommended if the sensory function is too low. >>>More
There are 5 types of nystagmus in clinical practice: 1. Ophthalmogenic tremor Most of them have severe damage to central vision and some kind of eye disease, such as congenital cataract, albinism, corneal leukoplakia or staphyloma, etc., and most of them are pendulum-shaped horizontal tremor. 2. Labyrinthine nystagmus is mainly caused by middle and inner ear diseases, which is horizontal, but there are fast and slow phases, accompanied by vertigo, hearing loss, and balance disorders. >>>More
Nystagmus is an involuntary, rhythmic, back-and-forth eye movement. The direction is divided into horizontal, vertical, and rotational type, with the horizontal type being the most common. Mainly caused by genetic mutations, nystagmus is not an independent disease, but a clinical manifestation of some diseases, nystagmus needs to be carried out for **, and reproductive intervention can be carried out through genetic testing to prevent the occurrence of nystagmus.
Nystagmus is mainly manifested as rhythmic eye swing that is not controlled by the human body when staring at the target with both eyes, and the patient himself cannot feel the nystagmus, but most of them feel dizziness, dare not open their eyes, dare not move, and in severe cases, they can be accompanied by nausea and vomiting, and can also be accompanied by other autonomic manifestations such as palpitation, cold sweat, and fatigue. In addition, according to the different **, other manifestations of brainstem cerebellar damage (such as unsteady walking, difficulty swallowing, choking on drinking water, limb weakness and numbness, etc.), inner ear involvement manifestations (such as tinnitus, ear fullness, etc.), and ocular manifestations (blurred vision, diplopia, etc.).