[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.