[Partial coherent interferometry--an alternative method for intraocular lens power calculation performed by ultrasonography].

PURPOSE: To compare axial length estimated by means of Zeiss IOLMaster and A-scan ultrasonography and anticipate postoperative refraction after IOL implantation with refraction measured after operation.

MATERIAL AND

METHODS

26 patients were analyzed. Measurement of axial length was performed by Zeiss IOLMaster and A-scan ultrasonography. Preoperative refraction was determined by both methods based on SRK/T calculation formula and 119.0 and 120.5 A-constant for IOL. Postoperative refraction was expressed as a spherical equivalent and was obtained by autokeratorefraktometry in the first day after cataract surgery.

RESULTS

Mean axial length measured by IOLMaster was longer by 0.06 mm in compared to ultrasound estimation (p < 0.001). The correlation between pre-operative refraction values determined by IOLMaster and post-operative measurements was statistically significant (p = 0.03).

CONCLUSIONS

Measurement of axial length performed by IOLMaster is longer than by ultrasonography. IOLMaster seems to be more reliable method than ultrasonography in intraocular artificial lens calculation in cataract surgery.