TY - JOUR T1 - Inhibition of experimental diabetic cataract by topical administration of RS-verapamil hydrochloride JF - British Journal of Ophthalmology JO - Br J Ophthalmol SP - 44 LP - 47 DO - 10.1136/bjo.88.1.44 VL - 88 IS - 1 AU - A Ettl AU - A Daxer AU - W Göttinger AU - E Schmid Y1 - 2004/01/01 UR - http://bjo.bmj.com/content/88/1/44.abstract N2 - Aim: To investigate the efficacy of verapamil eye drops for inhibition of diabetic cataract in rats. Methods: Diabetes was induced in 69 male Sprague-Dawley rats by an intraperitoneal injection of streptozotocin (65 mg/kg body weight). One group (DV) of animals was treated by instillation of one drop of 0.2% RS-verapamil hydrochloride in both eyes three times daily for 8 weeks. The placebo treated group (D) received the vehicle solution only. After 8 weeks the lenses were removed, inspected, and photographed using bright and dark field illumination. The transmission of He-Ne laser light was measured in the optical axis of each lens in order to determine the turbidity coefficient (t) as a measure of central lens opacity. Following digital image analysis, the integrated density as a measure of central and mid-peripheral opacities was determined. Results: Lenses of both groups developed peripheral cortical opacities not affecting the optical axis. Advanced and paracentral cortical opacities were present in 10 (16.7%) of the placebo treated lenses (D) and two (3.8%) of the verapamil treated lenses (DV). Complete corticonuclear cataract developed in four (6.7%) of the lenses from group D but none of the lenses from group DV. The mean lens turbidity t was determined to be 0.019 (SEM 0.002) mm−1 (n  =  52) in the verapamil treated diabetic rats (DV) and 0.042 (0.008) mm−1 (n  =  60) in the placebo treated group (D). This difference was statistically significant (p  =  0.0054). The mean integrated density was 274.91 (22.5) in group D (n  =  60) and 196.28 (20.7) in group DV (n  =  37). This difference was also significant (p  =  0.0037). Conclusion: Verapamil eye drops 0.2% administered three times daily are effective in inhibiting the progression of lens opacities in streptozotocin diabetic rats. ER -