Method for estimating the spheric aberration of the human crystalline lens in vivo.
PURPOSE. The authors describe a method for estimating the spheric aberration (SA) of the human crystalline lens in vivo. METHODS. This method was based on a comparison of the measured change in contrast sensitivity (delta log ( CSF)) of the eye and the calculated change in modulation transfer function of the cornea with undilated and dilated pupils. The method assumes that the total change in visual efficiency (delta log ( CSF)) in these two states is caused entirely by the SA of the eye combined with the Stiles-Crawford effect. RESULTS. Data are reported for 20 subjects (age range, 20-56 yr). SA for the whole eye was found to be positive and in the range 0-0.83 D (0-0.80 D using Stiles-Crawford apodization). The SA of the crystalline lens was generally negative and in the range 0 to -0.81 D (0 to -0.78 D using apodization). CONCLUSIONS. The method gives results consistent with previous reports in the literature. Despite potential limitations, the technique offers a new method for estimating the SA of the human crystalline lens in vivo.[1]References
- Method for estimating the spheric aberration of the human crystalline lens in vivo. Tomlinson, A., Hemenger, R.P., Garriott, R. Invest. Ophthalmol. Vis. Sci. (1993) [Pubmed]
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