RESUMO
Purpose: to compare the safety and efficacy of trypan blue 0.1 % and gentian violet 0.001% for anterior capsule staining in cases of white cataract
Methods: thirty eyes with age-related white cataract had anterior capsule staining with trypan blue 0.1% [15 eyes], and gentian violet 0.001% [15 eyes], under an air bubble followed by phacoemulsification with posterior chamber intraocular lens [PC IOL] implantation. The ease of creating a continuous curvilinear capsulorhexis [CCC] and intraoperative complications were noted. Postoperative examinations at 1day, 1week and 1month included visual acuity, anterior chamber reaction, and intraocular pressure [IOP] were documented. The mean phaco power and time were also recorded
Results: complete CCC was achieved in 24 eyes [80%], 6 eyes [20%] had extension of the capsulorehexis, thus the surgery was converted to conventional ECCE. All patients had a BCVA worse than 6/60 before surgery. One week after surgery, Twenty-three [76.7%] had a BCVA of 6/9 or better. Five eyes [16.7%] had a BCVA worse than 6/60 postoperatively. Examination of those eyes revealed preexisting posterior segment pathology. Two eyes [6.7%] had increased IOP, with the highest measured at 26mmHg postoperatively. Their BCVA were 6/24. These 2 eyes responded well to medication, and the IOP returned to normal by the second postoperative week. Almost all eyes achieved a BCVA of 6/9 from the first week postoperatively to the last follow-up. The side port and corneal tunnel were stained most intensely with gentian violet than trypan blue groups. All eyes had clear corneas and a quiet anterior chamber 1 month after surgery. The mean phaco power and time were not significantly different between the 2 groups [P=0.367 and P=0.12, respectively]
Conclusion: both trypan blue 0.1% and gentian violet 0.001% are safe and effective for staining and visualization of the anterior capsule during phacoemulsification of white cataract