When the chart for the near vision test with the distance positioning draw bar is used for testing vision, two testing distances can be chosen; and when in testing, the forehead of a user to be tested is pressed on the frontal plate, and since the distance between the fontal plate and ...
美 英 网络斯内伦视力表;斯耐伦视觉图片;视力检查表 英英 网络释义 n. 1. achartforvisiontestingonwhichareprintedrowsoflettersandnumbersindecreasingsizefromtoptobottom
Henry F. Allen, MD, has designed a set of four plastic cards to be used as a preschool vision test (Figure 8.9). The test is a valid index of visual acuity recorded in terms of a 30-foot (9 m) denominator. It is intended for preschool children, and results have been reliable for...
A method for vision testing of the present invention includes recording a value associated with an accuracy of identification of at least two of the letter, the numeral, and the pictorial objects on an eye chart by a person, and comparing the values for each eye of the patient. Because ...
Noun1.Snellen chart- display consisting of a printed card with letters and numbers in lines of decreasing size; used to test visual acuity display,presentation- a visual representation of something Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc. ...
would be less (e.g. several hundred dollars to replace a projector bulb). I strongly recommend this app for any physician who does visual screening, and certainly for eye specialists. It is simple enough for non-medical individuals to use to test their own vision as well....
SY-VC 5M test distance led visual eye vision test chart Feature of visual chart : Durable, Environmentally-Friendly and Energy Saving Slim but Delicate with Uniform Luminance Durable, High-definition and Ultra-bright Protect Your Eyes Adopting extra thick aluminum alloy as the fram...
glasses and eye test chart for Distance Vision Test themes,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素材、字体等,已先后为阿里巴巴、京东、亚马逊、小米、联想、奥美、盛世长城、百度、360、招商银行、工
During an eye test, eye doctors use eye charts to measure your vision at a set distance and compare it with other human beings. Eye doctors can use different eye test charts for different patients and situations. The three most common eye charts are: ...
test. As the blood level increases to toxic levels, the color visual acuity for a chart constructed for the particular drug should decrease. For example, since digoxin causes yellow vision, comparison of vision on an acuity chart with a white background may be better than the acuity with a ...