Normal sensibility curve at contrast (FACT) in children between 6 and 12 years of age in the Optometry Research Institute

Abstract

The functionally acuity contrast test (FACT) is useful in the detection and diagnosis so diverse ophthalmological ocular pathologies but is use is limited in childhood. The purpose of this study was build a normal curve in the range 1.5, 3.0, 6.0, 12.0 and 18.0 for special frequencies, in children between the ages of 6 to 11 who attend to Instituto de Investigaciones Optometricas of Universidad de La Salle Colombia. It was a descriptive study for test standardization, with o systematic random sample of 58 child (confidence 95%, sample error 5%) by a systematic random sample of the children that attend the pediatric optometry unit and who had previous optometry evaluation, visual acuity between 20/15 and 20/30 and optical correction when necessary. To establish this normal rank the media was taken into account plus or minus a standard deviation and the 25th and 75th percentage selected by its normal distribution, the one constructed by its media with some differences related to the curve of FACT of the manufacturer. The curves haven´t statistical differences (95% confidence intervals for media) between eye, age, dominant eye and refractive status, except between astigmatic and emetropic for 6.0 and 12.0 spatial frequencies. Also there was not concordance between Snellen and Fact visual acuity. The designing of this curve will allow for the validation of the FACT Test use in the optometry evaluation at the Instituto de Investigaciones Ooptometricas.