The Effect of Cycloplegia on Measurement of the Ocular Components

摘要: Purpose. The purpose of this study was to examine the effect cycloplegic agent on measurement, refractive error and ocular components. Methods. We compared two commonly used topical agents, 1 % tropicamide cyclopentolatc, for their measurement (by Canon R-l autorefraction), accommodative response autorefraction by conventional, subjective "pushup" method), crystalline lens power video phakometry calculation), axial dimensions A-scan ultrasonography) in 20 emmetropic moderately hyperopic children. Results. Comparison at each drug's reported time maximum cycloplegia (30 minutes (50 cyclopentolate) showed that distance vertical meridian differed +0.20 ± 0.30 diopters (D) (P = 0.008). average difference +0.07 ±0.10 mm anterior chamber depth 0.004), —0.03 0.05 thickness 0.025), —0.65 0.(39 D phakometrically measured < 0.001), +0.03 1.55 calculated 0.94), -0.09 0.19 vitreous 0.062, all paired / tests; positive signs denote greater values with cyclopentolate). Residual accommodation 0.4 7 0.67 when pushup method (/-" 0.013 0.08 respectively, test). All significant differences were consistently direction poorer tropicamide. Conclusions. Although tropicamide, as expected, cyclopentolate, degree appeared be small, minimal optical Invest Ophthalmol VisSci. 1994 ;35:515-527. v^linicians' use agents determine "true" manifest is widespread, especially infants Pharmaceutical paralysis often necessary relax habitual posture young hyperopes. However, amount required accomplish has been debated literature many years. belief more necessarily better led severe inconvenient procedures,