Journal of AAPOS : the official publication of the American Association for Pediatric Ophthalmology and Strabismus
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Comparative Study
Instrument-induced measurement errors during strabismus surgery.
The purpose of this study was to determine the clinical setting where errors in measurements of muscle position during strabismus surgery made by the Scott curved ruler or by calipers become important and to characterize the magnitude of those errors. ⋯ Both the Scott curved ruler and calipers are accurate in measuring arc lengths 9.0 mm or less. For longer arc length measurements, accuracy becomes dependent on axial length. The Scott curved ruler, although substantially more accurate than calipers for most common axial lengths, can introduce clinically important measurement errors when measuring arc lengths as small as 12 mm. Axial length should be considered when measuring muscle position during strabismus surgery.
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The cause of eyelid pruritus (itching) may be difficult to determine, particularly in preverbal children. Tearing, photophobia, or eye rubbing may be the first manifestation of leukemic infiltration or graft-versus-host disease, necessitating early appropriate therapy. We report a child in whom persistent eye rubbing developed after bone marrow transplantation for leukemia. Morphine administration was found to be the cause of this symptom.