Optomechanical eye model with imaging capabilities for objective evaluation of intraocular lenses

Abstract

The optomechanical eye model provided objective grading of IOLs through the evaluation of simulated visual acuity, which can be scaled usefully to human vision. The eye model also allowed the qualitative visualization of IOL imaging properties, making it potentially useful in characterizing and distinguishing different IOL types.

Impact of corneal aberrations on through-focus image quality of presbyopia-correcting intraocular lenses using an adaptive optics bench system

“…Several studies have chosen to modify the recommendation of the ISO 11979-2 12 by using such artificial corneas. 8,[21][22][23][24] Spherical aberration is the only HOA consistently found in corneas across large populations; however, individual corneas may have significant astigmatism and other HOAs. 17,18,25 Few studies have examined the impact of corneal aberrations on the through-focus retinal image quality and depth of focus under normal viewing conditions; that is, in white light.…”

Far and near visual acuity with multifocal intraocular lenses in an optomechanical eye model with imaging capability

“…The experimental model of the eye, which has been described, 52 closely reproduces the spatial and optical layout of the theoretical Gullstrand exact eye model. It has an aspherical poly(methyl methacrylate) (PMMA) cornea, variable pupil, and a correct anatomical location for the IOL.…”

“…39 In the present study, we used an in vitro approach based on a previously described optomechanical eye. 52 The first advantage of the method is that all IOLs are tested in a homogeneous optical environment that does not vary, unlike with in vivo comparisons. Second, staying true to the optical layout of the Gullstrand eye model and reproducing the foveal resolving power in the detection system allowed us to Figure 11.…”

“…For each IOL, multiple runs of a simulated contrast acuity test were performed according to a procedure described by Gobbi et al 52 Briefly, the simulated contrast acuity test involves visual acuity assessment. The eye model with an IOL implanted looks at computer-generated Early Treatment Diabetic Retinopathy Study (ETDRS) characters.…”

“…Near distance testing was performed by introducing calibrated relay optics conjugating the far distance plane at 6 m to the reading distance plane at 40 cm with a demagnification of 1:15. 52 Before each near test, the position of the retinal plane in the model eye was micrometrically adjusted for sharpest imaging to compensate for individual differences in IOL position and near add. The simulated contrast acuity test is largely independent of the reader's influence.…”