Ft Lauderdale, FL - A new study shows that the use of statins is associated with the progression of age-related macular degeneration (AMD), but the authors urge caution, saying that other causes may be the reason for the findings [1].

The authors presented the results of their study here at the Association for Research in Vision and Ophthalmology 2008 Annual Meeting.

"We are not saying that statins are a risk factor in the progression of age-related AMD. There are a lot of confounding variables. But what this study shows is that they don't seem to have a beneficial effect," lead author Dr Catherine Cukras (National Eye Institute, Bethesda, MD) said.

Using data from the Age-Related Eye Disease Study (AREDS), the researchers followed 1266 subjects for 11 years. The patients had neovascular AMD and/or central geographic atrophy (CGA).

The researchers found that 481 patients developed advanced AMD; among them, 323 eyes developed neovascular AMD and 233 developed CGA. Using multivariable analysis, they found that statin use was statistically significantly associated with the development of advanced AMD (odds ratio 1.43; 95% CI 1.12-1.83), but in analyses for types of advanced AMD, use of the drug was linked only with the development of neovascular AMD (odds ratio 1.76; 95% CI 1.34-2.30).

The researchers concluded that in AREDS, statin use was associated with patients developing advanced neurovascular AMD. However, previous studies have found an inconsistent association with cardiovascular risk factors, such as elevated cholesterol. Because statin use may be confounded by such conditions, no causal relationship should be drawn from this study's data. The study controlled for all AMD risk factors, including age, sex, education, smoking, body-mass index, hypertension, and antioxidant and zinc use.

Dr Frederick L Ferris III (National Eye Institute) pointed out,"We don't want patients to be concerned about the effects of statins on their eyes. [The drugs] have a beneficial effect on their life."

In an interview, Dr John T Thompson (University of Maryland, Baltimore) concurred: "The significance here is that there have been conflicting reports as to whether statins are protective, and this study says that they are not. There need to be further studies to sort this out."