The eye is the organ responsible for seeing the human body. It is located in a protective area of the bones known as the orbit of the eye. It is the duty of the muscles outside the eye to shift the head in different directions. The eye consists of different pieces, some of which are:
- Conjunctiva, thin and transparent membrane covers the surface of the eye, covers the inner membrane of the eyelid.
- Cornea: A semi-transparent dome-like tissue that enables light to penetrate and focus within the eye.
- Anterior chamber: which is between the cornea and the iris, a cavity filled with a fluid called water humor.
- Iris: The colored part of the eye and the function of the iris is to control the proportion of light entering the eye through the muscles responsible for the expansion or contraction of the black hole in the middle.
- Pupils, an element that determines the proportion of light that reaches the eye.
- The lens, located on the retina of light, is surrounded by a thin fiber-coated pocket that connects it to the brain wall.
- Retina: The retina consists of a neural tissue that detects light and converts it into nerve signals transmitted by the optic nerve to the brain.
- The optic nerve: The optic nerve consists of millions of nerve fibers that connect the eye to the brain and transmit nerve signals to the retina to the visual cortex of the brain.
- The retinal macula, also known as the macular, is a small part of the retina that consists of a variety of light-sensitive cells that help to see fine details.
- The choroid, a collection of small blood vessels located between the whites of the eye and the retina, has the function of delivering nerves and various parts of the eye, and supplying blood to the retina.
Eye diseases are common health conditions ranging from mild disorders that can be treated at home or go untreated, to serious disorders that require health care. Many people have at least one eye condition during their lifetime, and there are many problems that fall under the category of eye diseases, some of which are listed below.
· Eye strain
Eye strain is a product of fatigue and eye pain when doing activities that require high concentration, such as long driving, reading a book, or using an electronic device. Computer vision disorder or visual eye strain is known as eye exhaustion caused by excessive use of electronics. State of development, with the need to see a doctor in case of continued suffering.
Cataracts are a gradual surface of the blur lens that begins with an irregular accumulation of protein that affects the lens’s ability to transmit clear images to the retina, ultimately leading to loss of vision.Causes that can lead to cataracts include:
- Exposure to ultraviolet light
- Exposure to eye injury
- Exposure to radiation therapy
- Some health problems such as diabetes
- Long-term use of certain drugs such as steroids
· Blue water
Blue water is a damage to the optic nerve that transmits signals to the brain from the eye.This condition is caused by the accumulation of fluid in the forehead of the eye, which leads to increased pressure.It can produce blue water if it is not diagnosed and treated early. The problem of glaucoma is a common condition in the eye, especially in the 1970s and 1980s, the collection of fluids is often stimulated, leading to glaucoma, including:
- Family history of the disease.
- Belonging to Asian, African or Caribbean islands.
- Some health problems, such as diabetes, or other visual disturbances.
· Night blindness (blindness)
Nocturnal blindness or lack of erythrocyte is not a disease in itself, but it is a symptom that can accompany a number of different eye disorders, especially those affecting the retina, which reduces vision in low light or at night, and may cause suffering from Ashi:
- Retinitis pigmentosa
- Glaucoma or blue water medications that cause pupils to narrow
- Cataract or white water
- Palace of the jerk
- Vitamin A deficiency
It is the movement of the eyes in two different ways, each eye focusing on something different from the other, resulting from problems in the muscles of the eye, or nerves that transmit information to the muscles, or to the center of movement control directed to the movement. Strabismus affects children frequently, especially in the early years of life, and such a condition is called endometriosis.
· Amblyopia (lazy eye)
Strabismus (lazy eye) in middle-aged children and adults in the United States is one of the most common causes of partial or total vision loss in one eye. Early childhood children may develop so that one eye does not develop during growth normally, leading to visual impairment, according to a survey published in the nation, the strabismus affects about 2% of children in the United States, and it causes amblyopia amblyopia.
Farsightedness is the problem of seeing or not seeing nearby objects clearly.
Myopia is one of the most common types of eye diseases before the age of forty, and this situation conflicts with the problem of farsightedness, where a person is able to see nearby objects and difficult to distinguish distant objects, and this situation is triggered by an increase in the frequency of the cornea or lens of the eye, Or an increase in the length of the eyeball, the possibility of nearsightedness.