Triamcinolone-induced cataract in eyes with diabetic macular oedema: 3-year prospective data from a randomized clinical trial.
OBJECTIVE
To describe the 3-year risk of cataract after intravitreal triamcinolone (IVTA) injections for diabetic macular oedema and the outcomes of cataract surgery.


METHODS
Prospective data from a randomized clinical trial were analysed. At baseline, 27 phakic eyes with diabetic macular oedema were randomized to receive IVTA and 25 to receive sham injection. After 2 years, initial sham-treated eyes were eligible to receive IVTA as the study became open label for the third year. The cumulative incidence of cataract surgery was the primary outcome of the study. Other outcomes assessed included progression of cataract, best-corrected logarithm of the minimal angle of resolution visual acuity before and after surgery and central macular thickness.


RESULTS
Over the 3 years of the study, 15/27 (56%) phakic eyes in the IVTA treated group underwent cataract surgery as compared with 2/25 (8%) initial sham-treated eyes (P < 0.001). Mean visual acuity 6 months after cataract surgery was better than at entry into the trial. Two (15%) of the eyes in the IVTA-treated group undergoing cataract surgery had a loss of >15 letters. In the IVTA-treated group, 10/15 (67%) eyes that had three or more injections had progression of posterior subcapsular cataract by > or = 2 grades as compared with only 2/12 (17%) eyes that had fewer than three injections (P = 0.009).


CONCLUSIONS
Over half of the eyes receiving IVTA injections for diabetic macular oedema required cataract surgery within 3 years. In eyes with three or more IVTA injections, two-thirds had progression of posterior subcapsular cataract. Visual outcomes after cataract surgery were generally good, although a small proportion of eyes lost greater than 15 letters over the course of the study.
Gillies
Mark C
MC
Department of Clinical Ophthalmology, Save Sight Institute, University of Sydney, Sydney, New South Wales, Australia. mark@eye.usyd.edu.au
Islam
Fakir M A
FM
Larsson
Jörgen
J
Pasadhika
Sirichai
S
Pasadhika
Sirichi
S
Gaston
Chris
C
Zhu
Meidong
M
Wong
Tien Y
TY
D000368:Aged; D002386:Cataract / Q000139:chemically induced* / Q000145:classification; D002387:Cataract Extraction / Q000706:statistics & numerical data; D005260:Female; D005938:Glucocorticoids / Q000008:administration & dosage / Q000009:adverse effects*; D006442:Glycated Hemoglobin / Q000032:analysis; D006801:Humans; D007267:Injections; D008269:Macular Edema / Q000175:diagnosis / Q000188:drug therapy*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012307:Risk Factors; D041623:Tomography, Optical Coherence; D014222:Triamcinolone Acetonide / Q000008:administration & dosage / Q000009:adverse effects*; D014792:Visual Acuity / Q000502:physiology; D014822:Vitreous Body
D005938:Glucocorticoids; D006442:Glycated Hemoglobin; D014222:Triamcinolone Acetonide; C517652:hemoglobin A1c protein, human