[Comparison of refraction with or without cycloplegia using Retinomax® or Plusoptix® devices]

Abstract

Purpose: To evaluate the refraction in children measured with Plusoptix^® without cycloplegia vs. Retinomax^® apparatus with cycloplegia.

Patients and methods: Measure of refraction with Plusoptix^® in children>1year old referred for systematic vision screening, then measurement after cycloplegia with cyclopentolate by the Retinomax^® device.

Results: Thirty-three children were included, i.e. 66eyes. Mean age was 40.7months (minimum 12; maximum 114). The Spearman correlation coefficient for the spherical equivalent was 0.52 (Plusoptix^® vs. Retinomax^® comparison; P<0.0001=moderate correlation). The Spearman correlation coefficient was 0.73 for astigmatism (Plusoptix^® vs. Retinomax^® comparison; P<0.0001=strong correlation). The Plusoptix^® sensitivity for measurement of refraction was 57%, 43% and 43% respectively for spherical equivalent, sphere and astigmatism.

Discussion and conclusion: The correlation of astigmatism values is strong, whereas the correlation of sphere values is moderate. Plusoptix^® seems to be unable to measure the exact refraction, because there is too large a dispersion of refraction measurements with Plusoptix^®, compared to the exact refraction measured with the Retinomax^®. Moreover, the sensitivity of Plusoptix^® is low. Cycloplegic refraction remains indispensable in children.

Keywords: Child; Cycloplegia; Cycloplégie; Enfant; Refraction; Réfraction.