Optical quality in eyes with aspheric intraocular lenses and in younger and older adult phakic eyes: Comparative study

Rękas, Marek; Krix-Jachym, Karolina; Zelichowska, Beata; Ferrer-Blasco, Teresa; Montés‐Micó, Robert

doi:10.1016/j.jcrs.2008.10.036

Cited by 9 publications

(11 citation statements)

References 29 publications

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“…Previous studies reported that in cataract-free eyes, the total HOA ranged from 0.27 to 0.58 μm, [16][17][18][19] coma from 0.14 to 0.21 μm, [20][21][22] and spherical aberration from 0.02 to 0.22. 16,18,20,[23][24][25][26] However, the total HOA (0.88, 1.22, and 1.31 μm) and coma (0.47, 0.67, 0.76 μm) were significantly increased in the good visual acuity cataract patients of our study compared with those in the cataract-free eyes of previous studies, [16][17][18][19][20][21][22] indicating visual deteriorations in these patients. Spherical aberrations of our patients were either more negative (−0.16 μm in the N group) or more positive (0.35 μm in C and N+C groups) than those of cataract-free eyes reported previously.…”

Section: Discussioncontrasting

confidence: 78%

“…Spherical aberrations of our patients were either more negative (−0.16 μm in the N group) or more positive (0.35 μm in C and N+C groups) than those of cataract-free eyes reported previously. 16,18,20,[23][24][25][26] Internal aberrations may better represent the lens-induced changes, which were all significantly increased compared with the cataract-free eyes reported previously. [27][28][29] Thus, the relatively aggravated wavefront results might imply the Specific components of wavefront analysis may also predict specific visual complaints.…”

Section: Discussionmentioning

confidence: 64%

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Objective functional visual outcomes of cataract surgery in patients with good preoperative visual acuity

Zhu

et al. 2016

Eye

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Purpose To explore the objective functional visual outcomes of cataract surgery in patients with good preoperative visual acuity. Methods We enrolled 130 cataract patients whose best-corrected visual acuity (BCVA) was 20/40 or better preoperatively. Objective visual functions were evaluated with a KR-1W analyzer before and at 1 month after cataract surgery. Results The nuclear (N), cortical (C), and N +C groups had very high preoperative ocular and internal total high-order aberrations (HOAs), coma, and abnormal spherical aberrations. At 1 month after cataract surgery, in addition to the remarkable increase of both uncorrected visual acuity and BCVA, both ocular and internal HOAs in the three groups decreased significantly after cataract surgery (all Po0.05). Point spread function and modulation transfer functions were also improved significantly in these patients (all Po0.05). Conclusions The objective functional vision of patients with 20/40 or better preoperative BCVA improved significantly after cataract surgery. This finding shows that the arbitrary threshold of BCVA worse than 20/40 in China cannot always be used to determine who will benefit from cataract surgery.

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Section: Discussioncontrasting

confidence: 78%

Section: Discussionmentioning

confidence: 64%

Objective functional visual outcomes of cataract surgery in patients with good preoperative visual acuity

Zhu

et al. 2016

Eye

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“…Patients with larger pupils seem to benefit more from aspheric IOLs under mesopic and scotopic conditions; however, elderly patients have a smaller pupil (senile miosis) than younger patients. 43,44 This may partly explain the lack of clinical benefit noted with an aspheric IOL in the older population. Another reason the benefits of aspheric IOLs are less than expected could be the Stiles-Crawford effect, which can minimize the effect of spherical aberration in eyes with a pupil larger than 4.0 mm.…”

Section: Discussionmentioning

confidence: 99%

Comparison of visual performance with an aspheric intraocular lens and a spherical intraocular lens

Thiagarajan¹,

McClenaghan²,

Anderson³

2011

Journal of Cataract and Refractive Surgery

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“…[35][36][37][38][39] Computer eye models are an excellent tool to identify the relative contribution of different factors that affect optical quality in pseudophakic eyes, which is helpful to evaluate the real impact of new IOL designs and the potential need to improve cataract surgery.…”

Section: Intraocular Lens Alignment Rosales De Castro Jimenez-alfarmentioning

confidence: 99%

Intraocular lens alignment from Purkinje and Scheimpflug imaging

Rosales

Castro

Jiménez-Alfaro

et al. 2010

Clinical and Experimental Optometry

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The improved designs of intraocular lenses (IOLs) implanted during cataract surgery demand understanding of the possible effects of lens misalignment on optical performance. In this review, we describe the implementation, set-up and validation of two methods to measure in vivo tilt and decentration of IOLs, one based on Purkinje imaging and the other on Scheimpflug imaging. The Purkinje system images the reflections of an oblique collimated light source on the anterior cornea and anterior and posterior IOL surfaces and relies on the well supported assumption of the linearity of the Purkinje images with respect to IOL tilt and decentration. Scheimpflug imaging requires geometrical distortion correction and image processing techniques to retrieve the pupillary axis, IOL axis and pupil centre from the three-dimensional anterior segment image of the eye. Validation of the techniques using a physical eye model indicates that IOL tilt is estimated within an accuracy of 0.261 degree and decentration within 0.161 mm. Measurements on patients implanted with aspheric IOLs indicate that IOL tilt and decentration tend to be mirror symmetric between left and right eyes. The average tilt was 1.54 degrees and the average decentration was 0.21 mm. Simulated aberration patterns using custom models of the patients eyes, built using anatomical data of the anterior cornea and foveal position, the IOL geometry and the measured IOL tilt and decentration predict the experimental wave aberrations measured using laser ray tracing aberrometry on the same eyes. This reveals a relatively minor contribution of IOL tilt and decentration on the higher-order aberrations of the normal pseudophakic eye.

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Optical quality in eyes with aspheric intraocular lenses and in younger and older adult phakic eyes: Comparative study

Cited by 9 publications

References 29 publications

Objective functional visual outcomes of cataract surgery in patients with good preoperative visual acuity

Objective functional visual outcomes of cataract surgery in patients with good preoperative visual acuity

Comparison of visual performance with an aspheric intraocular lens and a spherical intraocular lens

Intraocular lens alignment from Purkinje and Scheimpflug imaging

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