Title: Effect of depth of field on pseudoaccommodation after phacoemulsification and implantation of a posterior chamber intraocular lens
Abstract: Objective To study the relationship between depth of field and pseudoaccommodation in pseudophakia after phacoemulsification and implantation of a posterior chamber intraocular lens (IOL). Methods This study was based on measurements of 60 eyes of 30 patients aged 50 to 70 years(mean age 62.77±5.27 years) who had undergone phacoemulsification and implantation of a posterior chamber IOL. Forty-four pseudophakic patients were also included in the study. Accommodative amplitude, refractive error, and pupillary diameter were measured. Monocular accommodative amplitude was also measured under cycloplegia with astigmatism uncorrected and with an artificial pupil lens (2.5 mm in diameter). All data were analyzed with the SPSS11.0 for Windows. Results In pseudophakia, the monocular accommodative amplitude was (2.35±1.14)D. Astigmatism and artificial-pupil induced monocular accommodative amplitude were 0.21 D and 0.16 D, respectively. The diameter of the pupil before and after accommodation was (4.52±0.66)mm and (2.72±0.64)mm, respectively. No correlation was found between monocular accommodative amplitude and the change in pupil diameter before and after accommodation(r=0.164, P=0.305). Monocular accommodative amplitude measured under cycloplegia with astigmatism uncorrected and an artificial pupil lens was (0.61±0.18)D and (0.77±0.14)D, respectively. Conclusion Depth of field resulting from the pupil and single myopic astigmatism is one factor, but not the key factor, of the mechanism of pseudoaccommodation in pseudophakia after phacoemulsification and implantation of a posterior chamber IOL. Increasing depth of field is not an effective way to improve pseudoaccommodation.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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