Colour Defects Flashcards
What are the two types of PHOTORECEPTORS IN THE RETINA?
Rods and Cons
Rods or Cones : Scotopic Vision
Rods
Rodes or Cones : Dim / Dark Light
Rods
Rodes or Cones : Lights In Shades Of Grey
Rods
Rodes or Cones : Night Time
Rods
Rodes or Cones :
Decrease in Visual Acuity
Decrease in Colour Vision
Decrease in Edge Detection
Rods
Rodes or Cones :
Pigment : Rhodopsin
Rods
Rodes or Cones : Retinal and Opsin
Rods
Rodes or Cones :
Density : Peripheral of Retina
Rods
Rodes or Cones : Photopic Vision
Cones
Rodes or Cones : Bright Light
Cones
Rodes or Cones :
Good for Visual Acuity
Good for Colour Vision
Good for Edge Detection
Cones
Rodes or Cones :
Pigment : Photopsin
Cones
Rodes or Cones :
Density : Central of Retina (Fovea)
Cones
Cones Pick Up What?
Red :
Blue
Green
Define TRANSDUCTION
Rods and Cones responds to light THE SAME WAY.
Process is the same/
Where are Rods and Cones located?
Retina
What are Rods and Cones?
Light Photo-receptors
MONOCHROMACY
NO COLOUR
NO CONES, ONLY RODS
DICHROMACY
DEPENDS WHICH CONE / OPSIN IS MISSING
PROTANOPIA
Missing RED Opsin
DEUTERANOPIA
Missing GREEN Opsin
TRITANOPIA
MISSING BLUE OPSIN
TRICHROMACY
NORMAL COLOUR VISION
ALL CONES ARE PRESENT
ANOMALOUS TRICHROMACY
ONE CONE OPSIN IS FAULTY BUT STILL FUNCTIONS AT SOME LEVEL
