Visual acuity (VA) commonly refers to the clarity of vision, but technically rates an animal's ability to recognize small details with precision. Visual...

Near visual acuity or near vision is a measure of how clearly a person can see nearby small objects or letters. Visual acuity in general usually refers...

No or mild visual impairment – presenting visual acuity better than 6/18 Category 1: Moderate visual impairment – presenting visual acuity worse than...

A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who...

ophthalmologists, orthoptists, optometrists, and vision scientists to estimate visual acuity. The name of the chart is an abbreviation for "logarithm of the Minimum...

followed by 8 steps of visual acuity, pupil function, extraocular muscle motility and alignment, intraocular pressure, confrontational visual fields, external...

include visual acuity, tracking, color perception, depth perception, and object recognition. Unlike many other sensory systems, the human visual system – components...

An eye chart is a chart used to measure visual acuity comprising lines of optotypes in ranges of sizes. Optotypes are the letters or symbols shown on...

"contrast sensitivity acuity equivalents", with lower acuity values falling in the area under the curve. In patients with normal visual acuity and concomitant...

suppression of the hormone melatonin and entrainment of the body clock. Visual acuity is acuteness or clearness of vision, especially form vision, which is...

only cone cells; and is the region capable of producing the highest visual acuity or highest resolution. Across the rest of the retina, rods and cones...

assessment can be performed using a careful history, testing vision (visual acuity), and carrying out a penlight examination. Particular signs and symptoms...

of visual acuity. As is desirable of a good vision test, each of the four optotypes used in the symbols test has been proven to measure visual acuity similarly...

in spatial vision, including reductions in visual acuity, contrast sensitivity function, and vernier acuity, as well as spatial distortion, abnormal spatial...

are less light-sensitive, but allow the eye to see color and provide visual acuity, and rod cells, which are more light-sensitive, providing night vision...

abuse). Normal ophthalmology tests (best-corrected visual acuity, dilated fundus examination, visual field, and electroretinogram); not caused by previous...

romanized: Tablitsa Golovina-Sivtseva) is a standardized table for testing visual acuity, which was developed in 1923 by Soviet ophthalmologists Sergei Golovin...

ganglion cell layer contains two to four layers of cells, and is where visual acuity is below the optimum. The perifovea contains an even more diminished...

from a grey block, is then the measurement of visual acuity of the eye. For a human eye with excellent acuity, the maximum theoretical resolution is 50 CPD...

of our senses is defined by the finest detail we can discriminate. Visual acuity is measured by the smallest letters that can be distinguished on a chart...

clinical electroretinography, visual acuity testing, and visual perception. Bach is the creator of website Optical Illusions & Visual Phenomena, which began...

A blurred or gray spot in the central visual field is common when the retina is detached. Reduced visual acuity may persist after the fluid has disappeared...

development of visual acuity and contrast sensitivity through the first years of life. They have emphasized that, in diagnosing abnormal visual development...

essential for safe flight. Birds have a number of adaptations which give visual acuity superior to that of other vertebrate groups; a pigeon has been described...

correlated with CBS are a decrease of visual acuity, visual field loss, and elderly age. While characteristic features of visual hallucinations are not specifically...

the perceived visual angles. This finding has implications for spatial illusions such as the visual angle illusion. Visual acuity Visual angle illusion...

This is its ability to distinguish between two pixels. For normal visual acuity (6/6 vision), this angle is 1 arcmin. To obtain a fixed distance for...

survival (visual acuity better than 1.30 logMAR or 20/400 Snellen): 63% for OOKP and 49% for OKP 10-year functional survival (visual acuity better than...

and rely heavily on it for a number of tasks. They utilize their high visual acuity to obtain food, navigate their surroundings, distinguish and flee from...

Dutch ophthalmologist who in 1862 introduced the Snellen chart to study visual acuity. He took over directorship of the Netherlands Hospital for Eye Patients...