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Anterior chamber depth change helps calculate IOL’s accommodation
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A theoretical calculation of accommodation, based on change in anterior chamber depth, can help estimate the work being done by accommodative IOLs, according to a study in Germany. The study authors suggest that the theoretical approach may help distinguish between a patient’s pseudoaccommodation and the accommodation being achieved by the IOL itself.
Achim Langenbucher, PhD, and colleagues at the University of Nuremberg, Germany, used several methods to measure the degree of accommodation in 15 eyes of 15 patients 6 months after implantation of the HumanOptics 1CU accommodative IOL. Results in these patients were compared to results in a control group of 15 age-matched subjects.
Accommodation was measured using dynamic measurement with both objective and subjective techniques. In addition, the Zeiss IOL Master was used for static measurement of the changes in anterior chamber depth following artificial stimulation of accommodation with 2% pilocarpine drops, and a theoretical accommodation was calculated using this data.
At 6 months postop, mean accommodative amplitude was measured as 1 D using the PowerRefractor videorefractometer, 0.99 D using streak retinoscopy, 1.6 D using subjective near point push-up test and 1.46 D using defocusing.
After 2% pilocarpine application, anterior chamber depth decreased a mean 0.78 mm in the study group and 0.16 mm in the control group, indicating a mean accommodation of 1.16 D in the study group and 0.22 D in the control group, the authors said.
The study is published in the December issue of Archives of Ophthalmology.