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The experience of eye strain when reading in dim light has given rise to the common misconception that such an activity causes permanent eye damage. [3] When concentrating on a visually intense task, such as continuously focusing on a book or computer monitor, the ciliary muscles and the extraocular muscles are strained. This causes discomfort ...
Blepharospasm is aggravated by fatigue, stress, and environmental factors such as wind or air pollution. [ 21 ] Although blepharospasm is defined as a bilaterally symmetric disorder that affects both eyes, some research has reported unilateral onset.
The eyelid may not protect the eye as effectively, allowing it to dry. Sagging upper eyelids can partially block the field of view. Obstructed vision may necessitate tilting the head backward to speak. The areas around the eyes may become tired and achy. Eyebrows may be constantly lifted to see properly. Some of the risk factors for ptosis include:
A constriction response , [2] is the narrowing of the pupil, which may be caused by scleral buckles or drugs such as opiates/opioids or anti-hypertension medications. Constriction of the pupil occurs when the circular muscle , controlled by the parasympathetic nervous system (PSNS), contracts, and also to an extent when the radial muscle relaxes.
The word glaucoma comes from the Ancient Greek word γλαυκός (glaukós), meaning 'gleaming, blue-green, gray'. Of the different types of glaucoma, the most common are called open-angle glaucoma and closed-angle glaucoma. [7] Inside the eye, a liquid called aqueous humor helps to maintain shape and
Ophthalmoparesis can result from disorders of various parts of the eye and nervous system: Infection around the eye. Ophthalmoplegia is an important finding in orbital cellulitis. [1] The orbit of the eye, including mechanical restrictions of eye movement, as in Graves' disease.
Hypertelorism is an abnormally increased distance between two organs or bodily parts, usually referring to an increased distance between the orbits (eyes), or orbital hypertelorism. In this condition, the distance between the inner eye corners, as well as the distance between the pupils, is greater than normal.
Accommodative insufficiency (AI) involves the inability of the eye to focus properly on an object. Accommodation is the adjustment of the curvature of the lens to focus on objects near and far. In this condition, amplitude of accommodation of a person is lesser compared to physiological limits for his age. [ 1 ]