Comparison of cycloplegic and noncycloplegic retinoscopy in Chinese pre-school children.

Abstract

Twenty-seven Hong Kong Chinese children, aged 3 to 5 1/2 years, were recruited in this study to evaluate the relation between refractive error as measured retinoscopically before and after cycloplegia using cyclopentolate 1%. The noncycloplegic spherical refractive error of these children ranged from -0.75 to +2.50 D and approximately 98% of the Hong Kong pre-school children have a manifest spherical error within this range. The cycloplegic refractive error can be approximated by multiplying the spherical component of the manifest error by 1.45 and adding +0.39 D to the product, while keeping the astigmatic power and axis unchanged. Cyclopentolate 1% requires more time to produce mydriasis and cycloplegia in eyes with heavily pigmented irides; however, its final effect on refractive error is apparently independent of iris pigmentation and depends on the amount of spherical refractive error present.

• Authors: O Y Chan, M Edwards
• Journal: Optometry and vision science : official publication of the American Academy of Optometry (Optom Vis Sci) Vol. 71 Issue 5 Pg. 312-8 (May 1994) ISSN: 1040-5488 [Print] United States
• PMID: 8065707 (Publication Type: Journal Article)

Chemical References

• Ophthalmic Solutions
• Cyclopentolate

Topics

• Accommodation, Ocular (physiology)
• Child
• Child, Preschool
• China
• Ciliary Body (drug effects)
• Cyclopentolate (administration & dosage)
• Humans
• Ophthalmic Solutions
• Optometry (instrumentation)
• Refractive Errors (physiopathology)
• Reproducibility of Results