Pseudoisochromatic plates

Pseudoisochromatic plates are specialized color tests used to detect color vision deficiencies, particularly red-green color blindness. They consist of patterns made of many small colored dots arranged to form numbers or shapes visible only to those with normal color vision. If someone has a color vision impairment, they may not see the hidden figures or distinguish certain colors, indicating the presence of the deficiency. These plates are quick, simple, and effective screening tools used in ophthalmology and optometry to assess color perception without needing advanced equipment.