The chart is held at a specific reading distance (such as 14 inches) and you are asked to read the passage with the smallest type you can see. The chart is moved forward and back until you are able to read a certain type size. There have been several modifications of the Jaeger chart...
positioning an object at a distance from the eyes parallel to said generally vertical line and between the chart and the eyes; focusing the eyes on the object while moving the object progressively closer to the eyes, resulting in a double image of said generally vertical line; and ...
eye chart 英[ai tʃɑ:t] 美[aɪ tʃɑrt] 释义 n. 视力检查表 英英释义 Noun 1. a chart that is read from a fixed distance; used as a test of vision
The ETDRS chart has become the preferred or required chart used in most clinical trials. The standard test is performed at a distance of 4 meters. Use of pinhole The pinhole disc, if placed before the eye, eliminates peripheral rays of light, improves contrast, and generally improves vision ...
英英释义 a chart that is read from a fixed distance; used as a test of vision 访问沪江小D查看eye chart的更多详细解释>相关短语 N. N. N. N. N. N. culture medium 【医】 N.N.N.培养基(含琼脂、盐、兔血,用以培养黑热病病原体) N. P. N. 【医】 非蛋白氮 chen n. yang n. ...
Named for Herman Snellen, a Dutch eye doctor in the mid-19th century who originated the Snellen eye chart, this fraction is actually very well known, even if most of us don’t really understand what it means. “Visual acuity is equal to the distance at which the test is made divided ...
For school nurses who want their vision screening toolboxes to include eye charts, national and international eye chart design guidelines are available to help ensure selected eye charts are standardized. A national consensus policy exists that recommends specific eye charts. And, a large body of ...
Comparing distance visual acuity measurement with a novel eye chart and the Landolt C chart in a population of children aged 6–18 yearsdoi:10.1007/s10792-016-0384-3John P. GorhamBeau B. BruceAmy K. HutchinsonSpringer Netherlands
I loaded it on a small iPad and a larger iPad Pro. The chart fills the screen on each which, obviously cannot be correct since they both say to use it at 8’. Either it must adjust the letters to the size of the screen or adjust the recommended viewing distance to compensate for the...
The test method includes: placing a test chart at a predetermined distance from a compound-eye distance measuring apparatus; measuring a distance to the test chart by the compound-eye distance measuring apparatus; and calculating a difference between the predetermined distance and the measured distance...