Related Experiment Videos
[Sensitivity of refraction measurement with the infrared videorefractometer VRB 200]
G C Gusek1, P Martus, H M Schönherr
1Augenklinik mit Poliklinik, Friedrich-Alexander-Universität Erlangen-Nürnberg.
Aim Of The Study:
This study investigates the sensitivity of a computerised videorefractor (VRB 200) for refractive errors, especially amblyopiogenic, in babies and infants.
Patients And Methods:
Videopictures from 312 eyes of 156 babies and infants were taken, evaluated and compared with the current measurements (skiaskopy or refractometry) of the university eye hospital Erlangen-Nürnberg.
Results:
255 (81.7%) of 312 eyes were evaluable. The VRB 200 achieves a sensitivity of 96.1% in hyperopic eyes (219 of 228 eyes) and 94.7% in myopic eyes respectively (18 of 19 eyes). Of 8 emmetropic eyes 6 were recognized correctly negative. Astigmatism could be estimated coarsely quantitatively in power and qualitativ in the axis with a sensitivity of 80% (92 of 115 eyes) and a specificity of 86% (121 of 140). Anisometropia over 2 dpt was recognized in 5 of 6 patients. A general statement concerning the specificity is not possible with this study, because it is not a mass screening procedure.
Conclusion:
This videorefractor is able to recognize semi-quantitatively ambylopiogenic refractive errors with high sensitivity.