The test seems simple enough ... the prototypes of this eye chart began with abstract shapes. Eventually, the chart included those familiar block letters. One of Snellen’s big accomplishments ...

Eye charts are designed to test visual acuity ... the letters are all consonants. The diverse shapes of the optoypes allow test subjects to identify verticals, horizontals, and diagonals.

optometrists each designed their own eye charts for testing patients. There was no standard, though, so the clinical test was far from universal. That changed in 1862 when ophthalmologist Hermann ...

A visual acuity test is an eye exam that checks how well you see the details of a letter or symbol from a specific distance. Visual acuity refers to your ability to discern the shapes and details ...

This eye test chart was first invented by Ferdinand Monoyer, a French opthalmologist, or eye doctor, who would have been 181 years old today. Born on 9 May 1836 in Lyon, Monoyer studied medicine ...