Читать книгу Essentials of Veterinary Ophthalmology - Kirk N. Gelatt - Страница 146

Stereoacuity is the measurement of the smallest detectable stereoscopic depth. Just like visual acuity, it is measured in arc minutes or arc seconds (see the following section on visual acuity). It is largely determined by the distance of the object, as obviously smaller disparities can be detected for nearby objects than for distant objects. For example, at a distance of 25 cm some humans can detect a depth of 25 μm! Of course, such fine discrimination is not possible for objects 100 m away. However, stereoacuity is also determined by other stimulus parameters such as color, contrast, orientation, size, duration of exposure, location (central or peripheral), and luminance.