Elsevier

Ophthalmology

Volume 116, Issue 2, February 2009, Pages 297-303
Ophthalmology

Original article
Risk of Advanced Age-Related Macular Degeneration after Cataract Surgery in the Age-Related Eye Disease Study: AREDS Report 25

https://doi.org/10.1016/j.ophtha.2008.09.019Get rights and content

Purpose

To assess the risk of advanced age-related macular degeneration (AMD) developing after cataract surgery.

Participants

Four thousand five hundred seventy-seven participants (8050 eyes) from a multicenter, controlled, randomized clinical trial, the Age-Related Eye Disease Study (AREDS).

Methods

Development of advanced AMD, either neovascular (NV) AMD or geographic atrophy (GA), was evaluated with annual fundus photographs, and history of cataract surgery was assessed every 6 months. Cox proportional hazard models with time-dependent covariates were conducted for NV AMD and GA separately.

Main Outcome Measures

Neovascular AMD, GA, and central GA (CGA; involving the center of the macula).

Results

The Cox proportional hazards model of right eyes showed nonsignificant hazard ratios of 1.20 (95% confidence interval [CI], 0.82–1.75) for NV AMD, 0.80 (95% CI, 0.61–1.06) for GA, and 0.87 (95% CI, 0.64–1.18) for CGA. Similar results were obtained for left eyes: 1.07 (95% CI, 0.72–1.58) for NV AMD, 0.94 (95% CI, 0.71–1.25) for GA, and 0.86 (95% CI, 0.63–1.19) for CGA. For participants with advanced AMD in 1 eye (AREDS category 4), the hazard ratios for fellow eyes were 1.08 (95% CI, 0.65–1.72) for NV AMD and 0.98 (95% CI, 0.64–1.49) for CGA.

Conclusions

The AREDS results showed no clear effect of cataract surgery on the risk of progression to advanced AMD.

Financial Disclosure(s)

The author(s) have no proprietary or commercial interest in any materials discussed in this article.

Section snippets

Study Population

Details of the study design and methods, presented elsewhere,16 are briefly summarized here. Eleven retinal specialty clinics enrolled 4757 participants in the AREDS from 1992 through 1998. Participants were 55 through 80 years of age at enrollment and had best-corrected visual acuity (VA) of 20/32 or better in at least 1 eye (the study eye[s]). Media had to be sufficiently clear to obtain adequate quality stereoscopic fundus photographs of the macula in all study eyes. VA was assessed by

Results

Table 1 gives the distribution of baseline characteristics for participants with and without cataract surgery. Risk of advanced AMD associated with cataract surgery is summarized in Table 2 and Figure 1 and is given in detail below.

Discussion

The results from the Cox proportional hazards models used to examine AREDS data show little evidence of a detrimental effect of cataract surgery on progression to advanced AMD. Use of the Cox regression model allows us to take advantage of a unique feature of AREDS, the ability to examine the effect of important covariates, including time-dependent covariates, on progression to late AMD. Results from the Cox models are not statistically significant and there are no consistent trends among

Acknowledgments

The authors thank Molly Harrington, MA, Jonghyeon Kim, PhD, and Martin Ho, MS, of the EMMES Corporation for extensive statistical assistance.

References (22)

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      Their study also demonstrated an association between cataract surgery and exudative AMD during a 5‐year follow-up period. However, this link was ambiguous, and some studies did not support it.38-40 There are several plausible explanations for the association between cataract surgery and exudative AMD, including cataract surgery-related inflammation, environmental photic retinopathy, and genetic factors.

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    Manuscript no. 2008-701.

    Financial Disclosure(s): The author(s) have no proprietary or commercial interest in any materials discussed in this article.

    Supported by contracts from the National Eye Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland.

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