98th Annual Meeting DOG 2000

  V 742

Hyperopia correction with the cw-diode laser – Results of a multicenter-study

R. Berret, M. Derse, B. Jean, T. Bende

Purpose: This study was performed to assess safety, efficiency and stability of the refractive change using a continuous wave Diode Laser for Thermokeratoplasty (DTK) with a larger number of patients.

Methods: This study reports 63 eyes of 52 patients with natural born hyperopia and a follow-up of more than 6 months. The treatments were performed with a double coagulation zone diameter (CZD) of 6 and 7 mm or 7 and 8 mm. Group A: 36 eyes with a preoperative spherical equivalent (SE) of +4,8± 2,0 D, an uncorrected visual acuity (UCVA) of 20/100± 20/125 and spectacle corrected visual acuity (SCVA) of 20/25± 20/80 received treatment with the 6 mm CZD. Group B: 27 eyes with a preoperative SE of +2,4± 0,5 D, UCVA of 20/63± 20/125 and SCVA of 20/20± 20/160 received treatment with the 7 mm CZD. The mean patient age was 42± 12 years with a range from 21 to 59 years. The ratio male:female was 3:4. Follow up at 1 week, 1, 3, 6, 9 and 12 months included manifest subjective refraction, UCVA, SCVA and computerized videotopography. Each applied coagulation ring consisted of 8 spots. Power per coagulation spot was
180 mW, exposure time per spot 4 seconds and thus the total energy per spot 720 mJ.

Results: One year postoperatively the mean SE was +1,6± 1,3 for group A and +0,4± 0,4 D for group B. In both groups the UCVA was improved already one week postoperative. Finally UCVA improved in group A to 20/32± 20/125 and in group B to 20/25± 20/100. No eye lost one or more lines of UCVA or SCVA. There were no sight-threatening complications. The stability of the UCVA was achieved from three months on, the SE stabilized around month six.

Conclusions: These first results of this study indicate, that continuous wave Diode Laser Thermokeratoplasty (DTK) is safe and effective for correction of low to moderate hyperopia. The study group will continue the follow up of the treated patients to confirm stability

Augenklinik Tübingen, Sektion für Experimentelle Ophthalmo-Chirurgie, Derendinger Str. 41, D - 72072 Tübingen