Strabismus

Written by Medicine and Health. Posted in Disease, Condition & Injury, Eyes, Head & neck conditions

(Tropia; Crossed Eyes)

Strabismus – Definition

In strabismus, one or both of the eyes turn in, out, up, or down. It usually occurs in children but may occur in adults. Permanent vision loss may result if strabismus is not detected and treated in a timely manner.

There are two types:

  • Constant strabismus — the eye turns all the time
  • Intermittent strabismus — the eye turns only some of the time, like in times of stress, illness, concentration, or when tired

Retinoblastoma

Written by Medicine and Health. Posted in Disease, Condition & Injury, Eyes, Head & neck conditions

Retinoblastoma – Definition

Retinoblastoma is a rare type of cancer found in the eye. In retinoblastoma, one or more tumors form in the retina. The retina is a layer of light-sensitive tissue that lines the back of the eye. It converts visual images into nerve impulses in the brain that allow us to see. If not treated, the tumors will continue growing. The cancer may grow along the optic nerve and reach the brain or it may travel to other parts of the body.

Cancer occurs when cells in the body (in this case retina cells) divide without control or order. Normally, cells divide in a regulated manner. If cells keep dividing uncontrollably when new cells are not needed, a mass of tissue forms, called a growth or tumor. Tumors can invade nearby tissue and spread to other parts of the body.

Retinitis Pigmentosa

Written by Medicine and Health. Posted in Disease, Condition & Injury, Eyes, Head & neck conditions

Retinitis pigmentosa – Definition

Retinitis pigmentosa (RP) is a group of inherited eye diseases that often leads to severe visual problems. The retina is a layer of light-sensitive tissue that lines the back of the eye. It converts visual images that we see into nerve impulses that it sends to the brain. Some types of RP are associated with other inherited conditions. This disorder is named for the irregular clumps of black pigment that usually occur in the retina with this disease.

Presbyopia

Written by Medicine and Health. Posted in Disease, Condition & Injury, Eyes, Head & neck conditions

Presbyopia – Definition

Presbyopia is the inability to focus on and clearly see objects that are at a normal reading distance or closer.

Presbyopia – Causes

Presbyopia is caused by an age-related, gradual loss of flexibility within the lens of the eye. Because the lens is less elastic, it cannot adequately change its shape to sharply focus on objects at close distances.

Adult Macular Degeneration

Written by Medicine and Health. Posted in Disease, Condition & Injury, Eyes, Head & neck conditions

Adult macular degeneration – Definition

The retina is the tissue that lines the back of the eye. It sends visual signals to the brain. The macula is part of the retina. It is responsible for central vision. Macular degeneration is decline of the macula. It causes a gradual loss of sharp, central vision. The condition is mainly a disease of aging. In rare cases, it can occur in younger people.