Aubert-Förster law

The "Aubert-Förster law" is derived from work carried out by Hermann Rudolph Aubert and the ophthalmologist Richard Förster. They performed a series of tests on vision outside the point of fixation, which they referred to as indirect vision. Their findings were published in 1857, in a treatise called Beiträge zur Kenntniss des indirecten Sehens.

Their data showed that visual acuity changes between central and peripheral vision in an approximately linear fashion with the visual angle of eccentricity.