Martin M., Auffarth G. U.

Universitäts-Augenklinik Heidelberg, INF 400, 69120 Heidelberg

Background: Autorefractors are applied for measurement of objective refraction. However measurement is sometimes not possible due to cataract or disturbing light reflexes caused by an intraocular lens. In our study we compared data of the autorefractor Humphrey (Zeiss) with data of the autorefractor Nidek (Nidek). The autorefractor Nidek is equipped with a special IOL-function. When applying this function objective refraction is performed with decreased light intensity, in order to avoid disturbing light reflexes from the intraocular lens.
Methods: 54 eyes of 28 patients were examined by the autorefractor Humphrey and Nidek as well applying the IOL-function of the Nidekautorefractor. Then means, standard mean deviations, range, mean differences and frequency of error were compared.
Results: Means of spheric aequivalents were +0.37 ± 3.65 dpt. (Nidek), +0.25 ± 3.64 dpt. (Nidek IOL-function) and -0.52 ± 3.22 dpt.(Humphrey). Range was -16.75 to +12.38 dpt. (Nidek), -17 to +12.38 dpt. (Nidek IOLfunction) and -15.5 to 11.25 dpt. (Humphrey). The mean differences were between Nidek/Humphrey 0.72 ± 0.99 dpt., between Nidek/Nidek-IOL 0.09 ± 0.35 dpt. and between Nidek-IOL/Humphrey 0.60 ± 1.04 dpt. Range was -1.25 to 4.5 dpt. (Nidek/Humphrey), -0.5 to 1.5 dpt. (Nidek/Nidek-IOL) and - 1.5 to 4.5 dpt (Nidek-IOL/Humphrey). Error in case of impossibility of measurement occured five times (Nidek), two times (Nidek IOL-function) and two times (Humphrey).
Conclusion: Our study showed differences of refraction data between the two autorefractors when examining the same eye at one time. The IOLfunction of the autorefractor Nidek was efficient in order to reduce frequency of error due to light reflexes caused by pseudophacic eyes.

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