Table 2

Patients who had been treated with argon laser trabeculoplasty

No membrane With membrane Thin membrane Thick membrane
Age68.1 (14)74.5 (9.7)76 (4.4)73.5 (12)
No of ALTs1.48 (0.59)1.83 (0.72)1.44 (0.53)2.07 (0.73)
IOP before TE26.2 (8.4)28.7 (9.6)23.7 (7.3)32 (9.7)
Total energy (J)9.6 (4.72)9.9 (5.67)7.3 (5.1)11.7 (5.5)
Total number of laser shots93.4 (48.3)99.6 (50.2)71.6 (27.1)119 (54.1)
Carboanhydrase inhibitors6/23 (26.1 %)13/23 (56.5 %)3/9 (33 %)10/14 (71.4 %)
Mean (SD)
Total energy=W × time × number of laser shots = J
Comparison of patients with and without membrane
No of ALTsp=0.124ns
Preoperative use of carboanhydrase inhibitorsp=0.077ns
Comparison of patients with thick membrane and without membrane
No of ALTsp=0.026s
IOP before trabeculectomyp=0.04s
Preoperative use of carboanhydrase inhibitorsp=0.022s
Comparison of patients with thick and with thin membrane
No of ALTsp=0.06ns
IOP before trabeculectomyp=0.055ns
Total energy (J)p=0.04s
No of laser shotsp=0.35s
  • ns = not significant; s = significant.

  • Eyes with thick membranes had significant more ALTs (p=0.026), a higher IOP (p=0.04), and more carboanhydrase inhibitors (p=0.022) preoperatively than eyes without membrane formation over the trabecular meshwork.

  • Eyes with thick membranes received more energy (p=0.04) and more laser shots (p=0.035) on the trabecular meshwork compared with patients with thin membrane formation.