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Vision is a fundamental physiological function, allowing us to detect and interpret the surrounding environment. A variety of tests are performed in the health-care setting to assess eye function, including visual acuity and color vision. Use Wolfram|Alpha to interpret typical eyeglass prescriptions, including correction power measured in diopters, or explore how individuals with certain vision deficiencies see the world.

Visual Acuity

Visual acuity is the ability of the eye to perceive fine details. Normal visual acuity is indicated as 20/20, meaning that one can discern what a person with normal vision can see from a distance of 20 feet.

Get information about visual acuity:

Vision Deficiency Simulation

Color blindness is common, and there are different types of color vision defects. The vision deficiency simulator in Wolfram|Alpha helps you experience how people with a particular condition see normal color images.

Simulate a vision deficiency:

Corrective Lenses

Explore optical properties of corrective lenses and interpret typical eyeglass prescriptions.

Get information about an eyeglass prescription:

Calculate the change in eyeglass prescription due to the tilt of lenses:

Dog Vision

Get images of objects as seen through a dog's eyes.

Apply dog vision to an image: