Objective assessment of nuclear cataract: Comparison of double-pass and Scheimpflug systems

Lim, Seung Kwan; Hwang, Je Hyung; Hwang, Kyu-Yeon; Chung, So‐Hyang

doi:10.1016/j.jcrs.2013.10.032

Cited by 54 publications

(53 citation statements)

References 13 publications

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“…Sachdev et al 15 reported an increase in HOAs in patients with nuclear and cortical opacification. Lim et al 25 found a positive linear correlation between ocular scatter index (measured by a double-pass system) and the Scheimpflug-derived lens density. In our study, the internal HOAs were significantly correlated with the quantification parameters derived from Scheimpflug lens densitometry, such as mean density (r Z 0.661, P !…”

Section: Discussionmentioning

confidence: 97%

Scheimpflug lens densitometry and ocular wavefront aberrations in patients with mild nuclear cataract

Faria-Correia¹,

Lopes²,

Monteiro³

et al. 2016

Journal of Cataract and Refractive Surgery

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PURPOSE:To test correlations between Scheimpflug optical densitometry and ocular higher-order aberrations (HOAs) in patients with mild nuclear cataract.SETTING: Cornea and Refractive Surgery Department, Hospital de Braga, Braga, Portugal. DESIGN:Retrospective single-center study. METHODS:In eyes with mild nuclear cataract, lens densitometry was evaluated by Scheimpflug imaging (Pentacam HR), which provided an objective quantification (mean density and maximum density) and grading (nuclear staging score) of the crystalline lens. A visual function analyzer that combines ray-tracing aberrometry and Placido disk-based topography (iTrace) was used to evaluate the total ocular and internal HOAs. RESULTS:The study comprised 40 eyes of 30 patients. The mean density of the lens nucleus was 8.99% G 0.76% (SD) (range 7.5% to 10.8%), and the mean maximum density was 27.96% G 6.97% (range 16.9% to 56.1%). Regarding the score of nuclear staging of the Scheimpflug device, 28 eyes had level 0 and 12 eyes had level 1. Significant positive correlations were found between the mean density and maximum density parameters and the internal HOAs (r Z 0.661, P < .001 and r Z 0.570, P < .001, respectively).CONCLUSIONS: There were significant correlations between the quantification parameters derived from Scheimpflug lens densitometry and ocular HOAs. The integration of these technologies can help in clinical decision making and in understanding the subjective symptoms of patients with mild nuclear cataracts.

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Section: Discussionmentioning

confidence: 97%

Scheimpflug lens densitometry and ocular wavefront aberrations in patients with mild nuclear cataract

Faria-Correia¹,

Lopes²,

Monteiro³

et al. 2016

Journal of Cataract and Refractive Surgery

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“…The OSI, another parameter obtained using the DP system, has been shown to be correlated with the Scheimpflug-measured lens density, subjective lens grading, and cumulative dissipated energy. The measurement of the OSI may improve the preoperative evaluation of nuclear cataracts and help predict phacodynamics in cataract surgery [20]. …”

Section: Discussionmentioning

confidence: 99%

“…It has previously been reported that several objective measurements obtained using the OQAS, including the MTF cut-off, OSI and Strehl ratio, differ between eyes with cataracts and control eyes [11, 16, 20, 21]. The MTF curve, computed from the point spread function (PSF), displays the percentage reduction of the contrast of the retinal image at various spatial resolutions and represents the combined effects of high-degree optical aberrations and scatter [16].…”

Section: Discussionmentioning

confidence: 99%

Utility of the optical quality analysis system for decision-making in cataract surgery

et al. 2018

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BackgroundA cataract is a common cause of vision impairment that requires surgery in older subjects. The Optical Quality Analysis System (OQAS, Visiometrics SL, Terrassa, Spain) assesses the optical quality of the eye in cataract patients. This study shows the role of the optical quality evaluation system for decision-making in cataract surgery. We investigated the clinical utility of the OQAS for decision-making in cataract surgery.MethodsSixty-seven eyes from 67 patients undergoing cataract surgery and 109 eyes from 109 control subjects were compared. The best corrected visual acuity (BCVA) was measured. The objective scatter index (OSI), modulation transfer function (MTF), Strehl ratio, predicted visual acuity (PVA) 100%, PVA 20%, and PVA 10% were measured using the OQAS. The sensitivity and specificity of the different parameters were analyzed using the receiver operating characteristic (ROC) curve. The main parameters measured were sensitivity and specificity.ResultsThe BCVA, OSI, PVA 100%, PVA 20%, and PVA 10% were higher in the cataract group compared to those in the control group, while the MTF and Strehl ratios were lower (p < 0.001 for all). ROC analysis showed that the OSI had the largest area under the curve and that the sensitivity and specificity of the OSI were 83.9 and 84.6%, respectively, at the optimal cut-off point of 2.35.ConclusionThe MTF, OSI, Strehl ratio, PVA 100%, PVA 20% and PVA 10% may be useful parameters for preoperative decision-making in cataract surgery. The OSI appears to be the most effective parameter for this purpose.

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“…The OSI shows the degree of objective scattering caused by the loss of ocular transparency 11. Normal OSI values in healthy eyes have been documented to be lower than 1.0 12.…”

Section: Discussionmentioning

confidence: 99%

A comparison of mesopic visual acuity and objective visual quality following cataract surgery with hydrophobic acrylic intraocular lenses

Beiko

Gostimir

Haj-Ahmad

2017

OPTH

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PurposeTo evaluate mesopic visual acuity and visual quality as measured by objective scatter index (OSI) in pseudophakic eyes with long-term follow-up after implantation of hydrophobic acrylic lenses made from two different lens materials.SettingThis study was carried out in a private clinic.DesignThis study was an observational cohort study.MethodsThis pilot study included 181 eyes of 136 patients who had undergone cataract surgery with implantation of monofocal hydrophobic acrylic intraocular lenses (IOLs), either Alcon AcrySof (82 eyes) or Abbott Medical Optics’ Tecnis (99 eyes). The monocular corrected distance visual acuity (CDVA) of the subjects was recorded under mesopic room illumination and OSI was measured by an optical quality analysis system using double-pass wavefront method.ResultsMean follow-up duration was 60.07±18.82 months. Eyes implanted with Tecnis IOLs had statistically significantly better mesopic CDVA (0.08±0.08) compared to those implanted with AcrySof IOLs (0.11±0.07) (P=0.020). Mesopic CDVA of 20/25 or better was found in 79.8% of eyes in the Tecnis group compared to 62.2% of eyes in AcrySof group. Similarly, OSI was also found to be statistically significantly better for Tecnis IOLs compared to AcrySof IOL group (mean OSI, Tecnis: 1.65±0.92, AcrySof: 2.01±1.36; P=0.033). When glaucomatous eyes were excluded, OSI was still significantly better (P=0.028) in the Tecnis IOL group.ConclusionThe eyes implanted with Tecnis IOLs showed better long-term optical performance in terms of both OSI and mesopic visual acuity in comparison to those with AcrySof IOLs.

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Objective assessment of nuclear cataract: Comparison of double-pass and Scheimpflug systems

Abstract: The OSI based on the double-pass system was correlated with the Scheimpflug-measured lens density, subjective lens grading, and CDE. The OSI may improve the preoperative evaluation of nuclear cataract and help predict phacodynamics in cataract surgery.

Cited by 54 publications

References 13 publications

Scheimpflug lens densitometry and ocular wavefront aberrations in patients with mild nuclear cataract

Scheimpflug lens densitometry and ocular wavefront aberrations in patients with mild nuclear cataract

Utility of the optical quality analysis system for decision-making in cataract surgery

A comparison of mesopic visual acuity and objective visual quality following cataract surgery with hydrophobic acrylic intraocular lenses

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