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Glossary of Ophthalmic Terms
beginning with letter P
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pebble Tweet Definition of pebble Like Definition of pebble on Facebook
noun 
  1. A small stone
  2. (geology) A rock fragment between 4 and 64 millimetres in diameter (especially a naturally rounded one)
  3. (curling) A small droplet of water intentionally sprayed on the ice that cause irregularities on the surface.
verb to pebble
  1. To pave with pebbles.
  2. (curling) To deposit water droplets on the ice. e.g. to pebble the ice between games.
     
perimeter Tweet Definition of perimeter Like Definition of perimeter on Facebook
noun 
  1. (mathematics) The sum of the distance of all the lengths of the sides of an object.
  2. The outer limits of an area. See Synonyms at circumference.
  3. (mathematics) The length of such a boundary.
  4. A fortified strip or boundary usually protecting a military position.
     
photogene Tweet Definition of photogene Like Definition of photogene on Facebook
noun 
  1. (dated) An afterimage
     
photopia Tweet Definition of photopia Like Definition of photopia on Facebook
noun 
  1. Normal daylight vision, in which the cone cells are used
     
presbyopia Tweet Definition of presbyopia Like Definition of presbyopia on Facebook
noun 
  1. inability, Inability of the eye, due to ageing, to focus on nearby objects
     
purblind Tweet Definition of purblind Like Definition of purblind on Facebook
adjective 
  1. Partially blind.
  2. Lacking in discernment or understanding.
     

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