What chart is used to screen for color blindness?

The Ishihara chart is specifically designed for screening color blindness. It contains a series of plates with colored dots that form numbers or shapes which can only be seen clearly by individuals with normal color vision. Those with color vision deficiencies will struggle to distinguish the numbers or shapes because they perceive the colors differently.

In contrast, the Snellen chart is utilized for vision acuity testing, assessing how well a person can see letters at a distance. The cover/uncover test evaluates ocular alignment and can help diagnose strabismus, but it is not related to color vision deficiencies. The red reflex examination checks for abnormalities in the eye, such as cataracts or other significant pathologies, but it does not screen for color blindness.

Thus, the Ishihara chart is the only proper tool among the options listed that is specifically designed for the detection of color vision deficiencies.