Positive Relative Accommodation
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Positive relative accommodation is a measure of the maximum ability to stimulate accommodation while maintaining clear, single binocular vision . This measurement is typically obtained by an orthoptist, ophthalmologist or optometrist during an eye examination using a phoropter. After the patient''s distance correction is established, he or she is instructed to view small letters on a card 40 cm from the eyes. The examiner adds lenses in -0.25 increments until the…mehr

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Positive relative accommodation is a measure of the maximum ability to stimulate accommodation while maintaining clear, single binocular vision . This measurement is typically obtained by an orthoptist, ophthalmologist or optometrist during an eye examination using a phoropter. After the patient''s distance correction is established, he or she is instructed to view small letters on a card 40 cm from the eyes. The examiner adds lenses in -0.25 increments until the patient first reports that they become blurry. The total value of the lenses added to reach this point is the PRA value. High PRA values ( or = 3.50 diopters) are considered to be diagnostic of disorders involving accommodative excess. Those with accommodative insufficiency typically have PRA values below -1.50 diopters