Color Vision Flashcards
what type of defect is congenital
boys, red/green and always bilateral
what type of defect is acquired
blue/yellow, males and females, and unilateral or bilateral
when do you test for color defects in clinic
every patient, annually, unilaterally
what are 5 causes of acquired color defects
cataracts, glaucoma ,diabetes, stroke, and optic nerve diseases (MS or brain tumors)
how far away do you hold the HRR plates
30 inches/ 76 cm
how fast should you turn pages 5-10
every 3 seconds
how do you record if plates 5-10 were correct in right eye
OD 6/6 HRR
what plates do you go to if 5 or 6 is wrong
plates 21-24
what plates do you go to if plates 7-10 were wrong
plates 11-20
what type of defect is present if plates 5 or 6 were wrong
blue-yellow
what type of defect is present if plates 7-10 were wrong
red-green
how do you diagnose which type of defect is present
the type that has the most correct
what happens if you get scattered answers
the patient is malingering
what are the 2 names for blue-yellow defect
Tritan (blue weak) and Tetartan (yellow weak)
what are the 2 names for the red-green defect
Protan (red weak) and Deutan (green weak)
