Transcription of Visual acuity measurements - hicsoap.com
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Visual acuity measurements - hicsoap.com
Guest editorialVisual acuity measurementshas been done incorrectly in most basicModern Visual acuity charts are designed so the lettersizes on each line follow a geometric progressionproblem relates to the difference between the arithmeticand geometric mean for a set of numbers. For the correct(ie, change in a uniform step on a logarithmic scale).1 3 The accepted step size has been chosen to be logaverage Visual acuity , the geometric mean must be used,unit, which is equivalent to letter sizes changing by awhich gives significantly different values than the arith-factor of between lines. This standard gave risemetic the logMAR (logarithm of the minimum angle ofThe simplest method for computing the proper aver-resolution) notation as shown in Table 1, column 3.
GUEST EDITORIAL Table 2. Visual acuity data set for 7 theoretical eyes. Measured Visual Snellen Decimal LogMAR Eye Acuity* Equivalent Equivalent Equivalent
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