Open-field autorefraction screening
Reviewed by Fiona Rowe

This study aimed to determine the efficacy of the Shin-Nippon NVision-K5001 autorefractometer using the open-field refractometry principle in the elimination of accommodation in children. One hundred and fourteen patients aged three to six years were recruited. After excluding ocular pathology other than refractive error, 106 were included; 51 male, 55 female with mean age of 5.3±0.9 years. Spherical values were 0.93±0.76D in non-cycloplegic and 1.60±1.07D in cycloplegic 5001 measurements versus 1.61±1.03D in cycloplegic refraction. Non-cycloplegic measurements were significantly more myopic than cycloplegic measurements. Cylinder values were -0.70±0.62D for non-cycloplegic and -0.68±0.59D for cycloplegic 5001 measurements versus -0.66±0.71D for cycloplegic refraction; these were non-significant differences. Spherical equivalent values also slowed significantly more myopic values than non-cycloplegic measurements. Cycloplegic J0 values measured by the 5001K device were significantly lower but values for J45 measurements were not significantly different. The results show that accommodation could not be eliminated in non-cycloplegic 5001 measurements with more myopic values found compared to cycloplegic measurements. Thus the authors recommend taking measures under cycloplegia as the best method to obtain the most accurate refractive evaluation results in this age group. 

Inability of open-field autorefraction to eliminate accommodation in pre-schoolers.
Kara C, Petricli IS.
JOURNAL OF PEDIATRIC OPHTHALMOLOGY AND STRABISMUS
2017;54:311-8.