Causes
“Photophobia or light sensitivity is a common eye complaint. It can result from several different conditions and in most cases is easily treatable.”
Eye Care Specialists: When the Light Hurts Your Eyes
Stimulants, Medication, Adrenaline
· “Certain medications and illegal drugs can cause photophobia by simply dilating the pupil and allowing an excessive amount of light to enter the eye.
· Frequent use of cocaine [other stimulants, such as adrenaline, can cause the pupils to dilate] can cause a chronic dilation of the pupil.
· This side effect may lead to the inappropriate use of sunglasses.”
· The Brain: Adrenaline
· Vision: Nutritional Optometry: Functional Photophobia
“The most common cause of photophobia is inflammation of the anterior region of the eye, which includes the colored iris.
· The muscular iris controls pupil size and adjusts the amount of light entering the eye.
· Just as a sore back hurts when you bend it, an inflamed iris muscle painfully constricts when light hits the eye.
· Even if the injured eye is patched, the light sensitivity continues because light hitting the uninjured eye causes both pupils to constrict.”
“Another common cause of photophobia is a cataract. When the natural clear lens of the eye becomes cloudy, a cataract has formed.
· Cataracts tend to scatter light, similar to a frosted window in wintertime.
· The disrupted image causes discomfort which is perceived as pain. It is not fully understood why this condition results in discomfort. Possibly, the scattered light may cause a brisk, spastic constriction of the pupil which may contribute to the feeling of discomfort. Most likely the feeling is subjective and develops at a higher, emotional level.
· Fortunately, symptomatic cataracts can be removed with a very high success rate, eliminating the photophobia.”
· The Brain: Serotonin: Serotonin Levels: General Effects
“Occasionally, a patient will complain of light sensitivity, for which no logical explanation can be found. Most of these individuals tend to be fair skinned, with blue eyes. The treatment is the judicious use of tinted glasses to relieve their symptoms.”
“People with lighter-colored eyes, cataracts, and those who suffer from migraine headaches are more likely to notice sensitivity to light and glare.”
“Often, photophobia is a symptom of another underlying problem, such as a
· corneal abrasion,
· uveitis, or
· A central nervous system disorder such as meningitis.”
“Light sensitivity may also be associated with
· retinal detachment,
· Contact lens irritations,
· Sunburn and
· refractive surgery.”
“Photophobia often accompanies
· Albinism,
· Total color deficiency (seeing only in shades of gray),
· Botulism,
· Rabies,
· Mercury poisoning,
· conjunctivitis,
· keratitis and
· iritis.”
“Some medications may cause light sensitivity as a side effect, including
· belladonna,
· furosemide,
· quinine,
· tetracycline and
· doxycycline.”