Influence of severity of nuclear cataract on optical biometry

Prinz, Ana; Neumayer, Thomas; Buehl, Wolf; Kiss, Barbara; Sacu, Stefan; Drexler, Wolfgang; Findl, Oliver

doi:10.1016/j.jcrs.2006.01.101

Cited by 43 publications

(41 citation statements)

References 17 publications

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“…This find was previously reported by Prinz et al [6], although this study found a weak correlation between nuclear cataract grade and the difference in AL (r=-0.28, p=0.01). However, the difference in AL did not correlate with cortical or posterior subcapsular cataract.…”

Section: Discussionsupporting

confidence: 90%

“…Prinz et al found correlation between nuclear cataract grade and the difference in AL because they had a mean of 3.5 ± 0.9 (range 1 to 6), while in our study the average nuclear cataract grade was lower (2.25 ± 1.00 range 1 to 5), that is, they had more severe cataract than the present study [6].…”

Section: Discussioncontrasting

confidence: 72%

“…Nevertheless, a precise IOL calculation is not easy, depending on several parameters, such as axial length (AL) [2][3][4][5][6], anterior chamber depth [3,5], keratometry [2][3][4][5] or the lens formula [2][3][4][5]. Accurate AL measurement has been demonstrated to be the main factor for IOL power calculation [2][3][4][5][6], highlight related with the ocular biometry.…”

Section: Introductionmentioning

confidence: 99%

“…Accurate AL measurement has been demonstrated to be the main factor for IOL power calculation [2][3][4][5][6], highlight related with the ocular biometry.…”

Section: Introductionmentioning

confidence: 99%

“…It seems that this group refractive index could vary with cataract grade, being higher as cataract grade increases [11]. For this reason, dense cataracts could induce a significant bias in AL value determined with PCI biometry or even fails the acquisition procedure [2,6]. Nevertheless, it is not entirely clear to what extent moderate cataracts affect AL measurements.…”

Section: Introductionmentioning

confidence: 99%

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Change in Axial Length Pre and Post Cataract Surgery Measured with IOL Master

López¹,

López²,

Juan³

et al. 2016

J Clin Exp Ophthalmol

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Objective: Cataract surgery with intraocular lens (IOL) implantation tries to get a refractive result nearby to the optic emmetropia. So an accurate IOL power calculation is mandatory, and axial length (AL) measurement is one of the most influential parameter in this calculation. IOL Master is one of the most popular devices to measure AL, which uses the same group refractive index of the lens for all patients, independently of the cataract grade. But lens refractive index is higher as cataract grade increases. Nowadays cataract tends to be operated earlier, so moderate cataracts are the most extracted in clinical practice. Therefore, it is important to study the influence of moderate lens opacity in AL measurements. The objective of this study was to compare the AL value measures with IOL Master, before and after uncomplicated cataract surgery in patients with moderate cataracts. Material and methods:This study included 153 eyes of 105 patients (67.51 ± 13.56 years old) undergoing uncomplicated cataract surgery. Lens opacity was determined with the LOCSIII scale and AL was measured using optical biometry (IOL Master; Carl Zeiss Meditec) before and one month after intervention. Intraoperative measurements (ultrasound time and fluid volume) were also registered.Results: Mean preoperative AL of 25.10 ± 3.19 mm (range 20.54 to 36.06; IC95% 24.59 to 25.60 mm) and postoperative of 24.88 ± 3.16 mm (IC 95% 24.37 to 25.39; range 20.43 to 35.79 mm). The mean AL difference before and after surgery was 0.19 ± 0.05 mm (p=0.549 ANOVA) with agreement limits from 0.09 to 0.29 mm. It was observed more difference in eyes with larger AL (r 2 =0.14 p<0.01). The average cataract grade in each category was: nuclear opacity 2.25 ± 1.00 (range 1 to 5) (p=0.564 ANCOVA), cortical opacity 2.04 ± 0.73 (range 0 to 4) (p=0.543 ANCOVA), posterior subcapsular opacity 0.44 ± 0.90 (range 0 to 4) (p=0.563 ANCOVA), and nuclear color 2.40 ± 1.05 (range 0 to 5) (p=0.558 ANCOVA), without statistical significant effect in the AL difference pre and after cataract surgery. The ultrasound time used during the surgery was 43 ± 29 seconds (p=0.525 ANCOVA) and the fluid volume was 4.73 ± 1.31 (p=0.560 ANCOVA) cubic centimeters without statistically significant relationship between these parameters and the difference in the AL measurement. Conclusions:The difference in AL measurement with IOL Master before and after cataract surgery in eyes with low grade of cataract should be related with IOL Master reproducibility especially in extreme-long eyes. Moderate cataract showed non-statistically effect on AL measurement with IOL Master biometry.

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Section: Discussionsupporting

confidence: 90%

Section: Discussioncontrasting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

“…Accurate AL measurement has been demonstrated to be the main factor for IOL power calculation [2][3][4][5][6], highlight related with the ocular biometry.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Change in Axial Length Pre and Post Cataract Surgery Measured with IOL Master

López¹,

López²,

Juan³

et al. 2016

J Clin Exp Ophthalmol

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The measurement of ocular axial length in normal human eyes based on an improved Twyman‐Green interferometer

Wang

Huangfu

Zhou

et al. 2021

Journal of Biophotonics

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In order to meet the demands of myopia prevention, as well as the increasing needs of measurement for refractive and cataract operations in China, a new axial length (AL) measurement system combining an improved Twyman-Green interferometer with digital signal processing has been established. The ALs of 33 eyes of different optical refractive subjects (À8.50~0.50 D) were measured with the New AL and intraocular lens (IOL) master. The repeatability of measurements with the New AL was assessed using coefficient of variation (CoV) and intra-group correlation coefficient (ICC). Comparison, correlation, linear regression and agreement of AL between devices were analyzed. There was good repeatability (CoV = 0.0617%, ICC = 0.9999) with the New AL and great agreement has been obtained with both devices. These show that the New AL is capable of providing precise AL values over the normal AL range compared to the IOL master, and indicate that the New AL developed can be used for routine clinical AL measurements.

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IOL Calculation for Particularly Dense Lenses

Vounotrypidis

2023

Cataract and Lens Surgery

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Influence of severity of nuclear cataract on optical biometry

Cited by 43 publications

References 17 publications

Change in Axial Length Pre and Post Cataract Surgery Measured with IOL Master

Change in Axial Length Pre and Post Cataract Surgery Measured with IOL Master

The measurement of ocular axial length in normal human eyes based on an improved Twyman‐Green interferometer

IOL Calculation for Particularly Dense Lenses

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