Visual performance of aspherical and spherical intraocular lenses: Intraindividual comparison of visual acuity, contrast sensitivity, and higher-order aberrations

Kasper, Thomas; Bühren, Jens; Kohnen, Thomas

doi:10.1016/j.jcrs.2006.07.029

Cited by 94 publications

(77 citation statements)

References 38 publications

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“…6 Both in the laboratory by using adaptive optics 3 and in clinical studies, aspheric IOLs have been shown to reduce ocular SAs, improve contrast sensitivity, and improve night driving performance. 2,4 However, 2 recent studies 13,14 reported no differences between aspheric and spherical IOLs in low-contrast visual acuity, high-contrast visual acuity, and contrast sensitivity. Although multiple factors may contribute to these conflicting findings, lack of optimization of residual ocular SA might play a role.…”

Section: Discussionmentioning

confidence: 99%

Custom optimization of intraocular lens asphericity

Wang

Koch

2007

Journal of Cataract and Refractive Surgery

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Purpose: To investigate the optimal amount of ocular spherical aberration (SA) in an intraocular lens (IOL) to maximize optical quality.Methods: In 154 eyes of 94 patients aged 40 to 80 years, implantation of aspheric IOLs was simulated with different amounts of SA to produce residual ocular SA from -0.30 µm to +0.30 µm. Using the VOL-CT program (Sarver & Associates, Carbondale, Illinois), corneal wavefront aberrations up to 6th order were computed from corneal topographic elevation data (Humphrey Atlas, Carl Zeiss Meditec, Inc, Dublin, California). Using the ZernikeTool program (Advanced Medical Optics, Inc, Santa Ana, California), the polychromatic point spread function with Stiles-Crawford effect was calculated for the residual ocular higher-order aberrations (HOAs, 3rd to 6th order, 6-mm pupil), assuming fully corrected 2nd-order aberrations. Five parameters were used to quantify optical image quality, and we determined the residual ocular SA at which the maximal image quality was achieved for each eye. Stepwise multiple regression analysis was performed to assess the predictors for optimal SA of each eye. Results:The optimal SA varied widely among eyes. Most eyes had best image quality with low amounts of negative SA. For modulation transfer function volume up to 15 cycles/degree, the amount of optimal SA could be predicted based on other HOAs of the cornea with coefficient of multiple determination (R 2 ) of 79%. Eight Zernike terms significantly contributed to the optimal SA in this model; the order of importance to optimal SA from most to least was: Z 6 0

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Section: Discussionmentioning

confidence: 99%

Custom optimization of intraocular lens asphericity

Wang

Koch

2007

Journal of Cataract and Refractive Surgery

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“…Moreover, the slow release of aqueous humor prevented abrupt shallowness of the anterior chamber and a resulting sudden change in IOP. Additional important advantages of controlling the flow of aqueous humor and controlling IOP include avoiding lens and iris damage, choroidal hemorrhage or effusion, and decompensation retinopathy [19][20][21][22][23][24]. None of these complications were observed in our series.…”

Section: Discussionmentioning

confidence: 90%

Immediate Anterior Chamber Paracentesis with a 30-Gauge Needle for Acute Primary Angle Closure

Kitnarong¹,

Boonyaleepun²,

Sakiyalak³

et al. 2017

J Clin Exp Ophthalmol

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Background: Primary angle-closure glaucoma (PACG) is more common among Asians than among Caucasians. Acute primary angle closure (APAC) is a serious associated complication in PACG patients. When conventional treatment fails, Anterior Chamber Paracentesis (ACP) can be performed to decrease IOP. Although slit knives are commonly used for performing ACP, other techniques can also be used to perform this procedure.

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“…One study found no significant difference in contrast sensitivity between spherical and aspheric lenses after three to four months. 52 Other studies have reported significant improvement in contrast sensitivity, 53,54 without a reduction in pseudo-accommodative amplitude. 55 A reduction in the depth of focus that can result from asphericity is an important consideration as most patients undergoing cataract surgery are presbyopic.…”

Section: Aspheric Lensesmentioning

confidence: 95%

Advances in cataract surgery

Ashwin

Shah

Wolffsohn

2009

Clinical and Experimental Optometry

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Cataract surgery is a technique described since recorded history, yet it has greatly evolved only in the latter half of the past century. The development of the intraocular lens and phacoemulsification as a technique for cataract removal could be considered as the two most significant strides that have been made in this surgical field. This review takes a comprehensive look at all aspects of cataract surgery, starting from patient selection through the process of consent, anaesthesia, biometry, lens power calculation, refractive targeting, phacoemulsification, choice of intraocular lens and management of complications, such as posterior capsular opacification, as well as future developments. As the most common ophthalmic surgery and with the expanding range of intraocular lens options, optometrists have an important and growing role in managing patients with cataract.

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Visual performance of aspherical and spherical intraocular lenses: Intraindividual comparison of visual acuity, contrast sensitivity, and higher-order aberrations

Cited by 94 publications

References 38 publications

Custom optimization of intraocular lens asphericity

Custom optimization of intraocular lens asphericity

Immediate Anterior Chamber Paracentesis with a 30-Gauge Needle for Acute Primary Angle Closure

Advances in cataract surgery

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