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The Collaborative International Dictionary
Photophobia

Photophobia \Pho`to*pho"bi*a\, n. [NL., fr. Gr. fw^s, fwto`s, light + ? fear.] (Med.) A dread or intolerance of light.
--Sir T. Watson.

Douglas Harper's Etymology Dictionary
photophobia

1799, from photo- + -phobia. Related: Photophobic.

Wiktionary
photophobia

Etymology 1 n. (context medicine English) symptom of excessive sensitivity to light and the aversion to bright light. Etymology 2

n. The fear of and/or aversion toward being photographed, having photographs published, or viewing photographs.

WordNet
photophobia
  1. n. a morbid fear of light

  2. pain in the eye resulting from exposure to bright light (often associated with albinism) [syn: photalgia]

Wikipedia
Photophobia

Photophobia is a symptom of abnormal intolerance to visual perception of light.thefreedictionary.com/photophobia citing:

  • Dorland's Medical Dictionary for Health Consumers. 2007
  • The American Heritage Medical Dictionary Copyright 2007
  • Miller-Keane Encyclopedia & Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. 2003
  • Millodot: Dictionary of Optometry and Visual Science, 7th edition. 2009 As a medical symptom, photophobia is not a morbid fear or phobia, but an experience of discomfort or pain to the eyes due to light exposure or by presence of actual physical sensitivity of the eyes,thefreedictionary.com/photophobia citing:
  • Gale Encyclopedia of Medicine. Copyright 2008
  • Mosby's Medical Dictionary, 8th edition. 2009
  • McGraw-Hill Concise Dictionary of Modern Medicine. 2002 though the term is sometimes additionally applied to abnormal or irrational fear of light such as heliophobia.thefreedictionary.com/photophobia citing:
  • The American Heritage Medical Dictionary Copyright 2007
  • Millodot: Dictionary of Optometry and Visual Science, 7th edition. 2009 The term photophobia comes from the Greek φῶς (phōs), meaning "light", and φόβος (phobos), meaning "fear".
Photophobia (biology)

In biology, photophobia (adjective: photophobic) refers to negative response to light.

Photophobia is a behavior demonstrated by insects or other animals which seek to stay out of the light.

In botany, the term photophobia/photophobic describes shade-loving plants that thrive in low light conditions.

Photophobia (or photophobic response) may also refer to a negative phototaxis or phototropism response.

Usage examples of "photophobia".

Photophobia, and even transient amblyopia, have been observed to follow small doses.

But the things that seized my whole attention were the yellow blobs of pus in the corners of the eyes, the mucopurulent discharge from the nostrils and the photophobia, which made the dog blink painfully at the light from the surgery window.

They have a congenital disorder, a kind of photophobia: allergy to strong light.

Bowman informs me that in the excessive photophobia, accompanying what is called scrofulous ophthalmia in children, when the light is so very painful that during weeks or months it is constantly excluded by the most forcible closure of the lids, he has often been struck on opening the lids by the paleness of the eye, --not an unnatural paleness, but an absence of the redness that might have been expected when the surface is somewhat inflamed, as is then usually the case.