To assess the backwards compatibility of HRT3 and HRT II examinations in cataractous eyes before and after surgery.Methods
43 patients waiting for first eye cataract surgery, 12 men and 31 women aged 75 ± 5 years, took part in the study. Optic nerve head (ONH) topographies were performed before cataract surgery and one month postoperatively using the HRT II software. These examinations were later accessed using the HRT3 software. The calculation of topography, the topography standard deviation (TSD), and the image alignment of the preoperative and the postoperative scans were evaluated. TSD ≤50 was considered acceptable.Results
The recorded data was accessed using the HRT3 software, and in 34 cases the topography could be calculated. The mean TSD of the 34 examinations obtained of the eyes before cataract surgery was 33 ± 18. Considering TSD ≤50 as acceptable, there were 28 reliable scans. Of the data obtained one month after cataract surgery, topographies using HRT3 could be calculated in 39 of 43 examinations. TSD was 21 ± 12 indicating improvement of the quality of the HRT after cataract surgery. The HRT3 software was able to calculate both the preoperative and the postoperative topography in 31 of 43 eyes (72 %); three of the baseline examinations were considered unreliable because of high TSD values, though. The contour line was correctly aligned in all 31, and the image size was unchanged in all cases.Conclusion
Successful topographies using HRT3 software could be calculated in two thirds of the eyes both before and one month after cataract surgery with stable image alignment and image size in all cases. Follow-up of the ONH topography over cataract surgery was possible in all eyes with reliable examinations.