Achromatopsia - Classification

Classification

• Acquired achromatopsia (Cerebral achromatopsia)
• Congenital/inherited achromatopsia
  • Complete typical achromatopsia
  • Incomplete atypical achromatopsia or Incomplete atypical dyschromatopsia
• Achromatopsia–The complete lack of the perception of color in a subject, seeing only in black, white, and shades of grey.
• Amblyopia–Defined conceptually by Duke-Elder (1973) as a monocular acuity deficit which is not due to refractive error or any organic abnormality. A neural condition. Poor spatial performance of the precision optical servomechanism of the eyes at nominal illumination levels without any morphological cause. Lazy eye.
• Hemeralopia–Reduced visual capacity in bright light. Colloquially, day-blindness.
• Nystagmus–This term is used variously to describe both normal and pathological conditions related to the oculomotor system. In the current context, it is a pathological condition involving an uncontrolled oscillatory movement of the eyes during which the amplitude of oscillation is quite noticeable and the frequency of the oscillation tends to be quite low.
• Photophobia–The avoidance of bright light by those suffering from hemeralopia.