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Quantitative measurements of the decentration distance of four kinds of intraocular lens.

PURPOSE
To investigate a quantitative method to measure decentration distance(DD) and analyze the DD of four kinds of intraocular lenses (IOLs).


METHODS
The pseudophakic eye photos were taken under the slit lamp after the IOLs were implanted a year or longer. Then the images were inputted into a computer and the Photoshop software was applied to analyze the DD. Four kinds of IOLs were analyzed, including AcrySof MA60BM (11 eyes), Allergan SA40N (11 eyes), AcrySof SA60AT/SA30AL (5 eyes), Corneal Quattro (4 eyes).


RESULTS
The mean value of DD was (0.2643 +/- 0.1574) mm in the AcrySof MA60BM group, (0.3536 +/- 0.1719) mm in the Array SA40N group, (0.3099 +/- 0.1529) mm in the SA60AT/SA30AL group, and (0.3261 +/- 0.1877) mm in the Quattro group. The difference of the DD values among these 4 kinds of IOLs had no statistic significance (F = 0.506, P = 0.681) and the values were not equal to zero (t = 10.508, P < 0.001).


CONCLUSION
The Photoshop method is a simple and efficient way for DD analysis. The modern foldable posterior-chamber-IOLs have good centration performances when implanted into the capsular bags.