#eye disorder

• Achromatopsic person — A person affected by achromatopsia, suffering from a total visual anomaly characterized by the congenital or acquired inability to distinguish colors, perceiving the environment exclusively in shades of white, black, and gray. As an adjective, the term describes an individual, an eye, or a visual system exhibiting this severe and rare form of total color blindness.
• Achromatopsia — A congenital or acquired ophthalmological condition, genetic or neurological in nature, characterized by the total inability to perceive the colors of the visible spectrum. The affected subject distinguishes only shades of white, black, and gray (monochromatic vision), a state often accompanied by reduced visual acuity, extreme sensitivity to light (photophobia), and involuntary eye movements (nystagmus).