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Jaume Pujol, Sergio Oscar Luque; Masurement of the pseudo-accommodation curve of intraocular lenses in virtually implanted subjects.. Invest. Ophthalmol. Vis. Sci. 2016;57(12):3106.
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© ARVO (1962-2015); The Authors (2016-present)
To measure the pseudo-accommodation curve of monofocal and multifocal commercial available IOLs in subjects virtually and non-invasively implanted. To validate a virtual IOL implant device as a tool to determine the pseudo-accommodation curve of IOLs prior to surgery.
Cycloplegic pseudo-accommodation curves of three different IOLs were measured in 3 subjects (39, 54 and 56 years old) using a device that performs virtual IOLs implants (VirtIOL, 10Lens S.L.U.). All subject had a BCDVA of 20/20 or better. A monofocal, a bifocal and a trifocal lens were tested. Pseudo-accommodation curves were obtained by measuring the visual acuity in a range from +1 to -5 D every 0.5 D. All subjects were corrected for distance. Pupil diameter was fixed at 4 mm for every measurement.The validation of the virtual implants was performed with a CMOS camera whose objective had similar numerical aperture to that found in the average human eye for a pupil of 4 mm (N.A = 0.12). Series of pictures were taken in the whole range of interest of the defocus curve in two different conditions: first, with the IOL and the artificial cornea focusing the images directly onto the camera sensor and then, with the CMOS camera and its objective focusing the images produced by the virtual implant device.
Similar pseudo-accommodation curves were obtained for the three subjects with differences smaller than +/- one line of VA in the whole range of interest. The bifocal and trifocal lenses showed better near vision in comparison to the monofocal IOL, as expected, but there was little difference for intermediate vision between them.Images and pseudo-accommodation curves obtained with the CMOS camera when IOLs focused images directly onto the image sensor or through VirtIOL were identical, indicating that VirtIOL can be used to evaluate images perceived through IOLs prior to surgery in eyes with normal transmittance.
It was possible to measure the pseudo-accommodation curve of commercial available monofocal and multifocal IOLs by means of virtual IOL implants.By a CMOS camera and its objetive, with similar optical parameters to those found in the eye, was possible to validate the performace of the virtual IOL implant device.We found little differences between trifocal and bifocal lenses for intermediate vision possibly due to its dependency with the pupil diameter that in our case was fixed at 4 mm.
This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.
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