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LogMAR chart
A LogMAR chart comprises rows of letters and is used by ophthalmologists and vision scientists to estimate visual acuity. This chart was developed at the National Vision Research Institute of Australia in 1976, and is designed to enable a more accurate estimate of acuity as compared to other charts (e.g., the Snellen chart).〔Bailey IL, Lovie JE. I (1976.) ''New design principles for visual acuity letter charts''. Am J Optom Physiol Opt. 53 (11): pp. 740-745.〕 For this reason, the LogMAR chart is recommended, particularly in a research setting.
When using the LogMAR chart, visual acuity is scored with reference to the Logarithm of the Minimum Angle of Resolution, as the chart's name suggests. An observer who can resolve details as small as 1 minute of visual angle scores LogMAR 0, since the base-10 logarithm of 1 is 0; an observer who can resolve details as small as 2 minutes of visual angle (i.e., reduced acuity) scores LogMAR 0.3, since the base-10 logarithm of 2 is 0.3; and so on.
==History==
The chart was designed by Ian Bailey and Jan E Lovie-Kitchin at the National Vision Research Institute of Australia.〔 They described their motivation for designing the LogMAR chart as follows: "We have designed a series of near vision charts in which the typeface, size progression, size range, number of words per row and spacings were chosen in an endeavour to achieve a standardization of the test task."
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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