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night blindness

noun

, Ophthalmology.
  1. a condition of the eyes in which vision is normal in daylight but abnormally poor at night or in a dim light; nyctalopia.


night blindness

noun

  1. pathol a nontechnical term for nyctalopia
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Derived Forms

  • ˈnightˌblind, adjective
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Other Words From

  • nightblind adjective
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Word History and Origins

Origin of night blindness1

First recorded in 1745–55
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Example Sentences

In most circumstances, rods are very sensitive to light, but in people with night blindness, the rods cannot accurately detect changes in light, and fail to function in the dark.

Ironically, the genetic alteration is surprisingly similar to one that degrades pigments in human retinas, causing night blindness.

He is afflicted by night blindness, a possible consequence of his own malnutrition early in life.

“I don’t drive anymore. I’m 61 and I get night blindness,” Chostler said before reflecting on the importance of having a transit stop nearby.

The actress, who suffers from night blindness, still refused and says she was told the building's front doors were locked and was sent in the direction of a dark stairwell.

From BBC

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night and daynight-blooming cereus