Frequency-Doubled Nd : YAG Laser Photocoagulation for Stage III Plus Retinopathy of Prematurity

Adisak Trinavarat M.D.

Jutalai Tanterdtham M.D.

Chakrapong Namatra M.D.

Apichart Singalavanija M.D.

Nuttawut Rodanant M.D.

ABSTRACT Objective : To evaluate the outcome of treatment for stage III Plus ROP using frequency-doubled Nd : YAG laser photocoagulation (532 mm. wavelength).

Method : A retrospective study of ROP cases treated with this laser via indirect ophthalmoscope who were followed up for at least 3 months between December, 1996 and May, 1998 was conducted.

Patient : Twenty four eyes of 12 infants with gestational age of 26-35 (29.2 ± 2.57) weeks and birth weight of 720-1,650 (1,050 ± 305) grams were evaluated.

Results : All eyes were treated within one week after detection of stage III plus. The follow-up period ranged from 4 to 17 months (11.5 ± 4.07 months). Regression of the retinopathy was found in 22 eyes after single treatment while two eyes required another session of treatment. Mean of the regression time was 3.916 ± 1.64 (2-8) weeks. Nineteen eyes showed normal posterior poles. Two had abnormal angulation of temporal vessels. Other two had macular heterotropia and one eye was found to have peripheral vitreous hemorrhage. No evidence of any visually significant complication from laser treatment was found.

Conclusion : The results suggest that frequency-doubled Nd : YAG laser can be an alternative for the treatment of ROP.

Thai J Ophthalmol 1999 ; January-June 13(1) : 17-21.

Key word Retinopathy of Prematurity, Frequency-doubled Nd : YAG laser.