Effect of pupil dilation on the accuracy of the IOLMaster

Heatley, Catherine J.; Whitefield, Laurence; Hugkulstone, Charles E.

doi:10.1016/s0886-3350(02)01491-8

Cited by 25 publications

(29 citation statements)

References 9 publications

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“…Thus, no significant change in AL is produced in response to pupil dilation using both the IOLMaster 500 © and LENSTAR © [6][7][8][9][10]. The slight, though significant, increase in CCT observed in our study is consistent with the findings of other authors, who noted significant increases in CCT after pupil dilation with tropicamide eye drops [14,15].…”

Section: Discussionsupporting

confidence: 90%

“…In three studies examining the effect of pupil dilation in IOLMaster 500 © measurements [6][7][8], no effects were observed on AL and only one study reported a significant difference in pre-and post dilation MK data [6]. In addition, in the only one study in which the ACD was measured, this variable was found to increase after pupil dilation.…”

Section: Discussionmentioning

confidence: 95%

“…Although, the significant decrease in LT of 11 microns observed in our study is clinically insignificant. In the only study in which a change in MK measured by optical biometry was detected after pupil dilation, the authors attributed this to chance [6]. Effectively, other optical biometry studies have revealed no change in corneal curvature after pupil dilation [7][8][9][10] and Effect of pupil dilation on measurements and IOL power calculation with IOLMaster700 5 …”

Section: Discussionmentioning

confidence: 99%

“…© [6] in that predicted IOL power varied by 0.5D to 1D in 12% of eyes and was within 1D and 2D in 4% after pupil dilation. Similarly, 9.1% of the eyes in one of the LENSTAR © studies [9] showed differences in IOL power calculated with the SRK/T formula from 0.5D to 1D.…”

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confidence: 91%

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Effect of pharmacological pupil dilation on measurements and iol power calculation made using the new swept-source optical coherence tomography-based optical biometer

Arriola‐Villalobos

Almendral-Gómez

Garzón³

et al. 2016

Journal Français d'Ophtalmologie

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Please cite this article in press as: Arriola-Villalobos P, et al. Effect of pharmacological pupil dilation on measurements and iol power calculation made using the new swept-source optical coherence tomography-based optical biometer. J Fr Ophtalmol (2016) Please cite this article in press as: Arriola-Villalobos P, et al. Effect of pharmacological pupil dilation on measurements and iol power calculation made using the new swept-source optical coherence tomography-based optical biometer. J Fr Ophtalmol (2016) Procedures. -Eighty-one eyes of 81 patients evaluated for cataract surgery were prospectively examined using the IOLMaster 700 © before and after pupil dilation with tropicamide 1%. The measurements made were: axial length (AL), central corneal thickness (CCT), aqueous chamber depth (ACD), lens thickness (LT), mean keratometry (MK), white-to-white distance (WTW) and pupil diameter (PD). Holladay II and SRK/T formulas were used to calculate IOL power. Agreement between measurement modes (with and without dilation) was assessed through intraclass correlation coefficients (ICC) and Bland-Altman plots. Results. -Mean patient age was 75.17 ± 7.54 years (range: 57-92). Of the variables determined, CCT, ACD, LT and WTW varied significantly according to pupil dilation. Excellent intraobserver correlation was observed between measurements made before and after pupil dilation. Mean IOL power calculation using the Holladay 2 and SRK/T formulas were unmodified by pupil dilation.Conclusions. -The use of pupil dilation produces statistical yet not clinically significant differences in some IOLMaster 700 © measurements. However, it does not affect mean IOL power calculation. © 2016 Elsevier Masson SAS. All rights reserved. MOTS CLÉSCohérence optique swept-source ; Dilatation pupillaire ; Biométrie ; Cataracte ; IOLMaster 700 © Résumé Propos. -Déterminer si la dilatation pupillaire modifie les mesures biométriques et le calcul de la puissance de l'implant intraoculaire obtenus avec un nouveau biomètre optique basé sur la tomographie par cohérence optique swept-source (IOLMaster 700 © ; Carl Zeiss Meditec, Jena, Allemagne) Méthodes. -Nous avons évalué prospectivement 81 yeux de 81 patients prévus pour la chirurgie de la cataracte au moyen du biomètre IOLMaster 700 © , avant et après dilatation pupillaire avec tropicamide 1 %. Les mesures réalisées ont été : longueur axiale (AL), épaisseur cornéenne centrale (CCT), profondeur de la chambre antérieure (épaisseur cornéenne exclue) (ACD), épaisseur cristallinienne (LT), kératométrie moyenne (MK), distance blanc à blanc (WTW) et diamètre pupillaire (PD). Les formules Holladay II et SRK/T ont été employées pour calculer la puissance de l'implant intraoculaire. Nous avons évalué la concordance entre les deux méth-odes de mesure (sous dilatation pupillaire et sans) au moyen des coefficients de corrélation intraclasse (ICC) et des graphiques de Bland-Altman. Résultats. -La moyenne d'âge des patients était de 75,17 ± 7,54 ans (intervalle : 57-92). Parmi les variables mesurées, la CCT,...

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 91%

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Effect of pharmacological pupil dilation on measurements and iol power calculation made using the new swept-source optical coherence tomography-based optical biometer

Arriola‐Villalobos

Almendral-Gómez

Garzón³

et al. 2016

Journal Français d'Ophtalmologie

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“…Some studies on dilatation and IOL measurement have found that pupil dilatation does not affect the accuracy of the IOLmaster [4]. Nevertheless, some surgeons believe that dilatation of the pupil causes patients to have poor fixation [4].…”

mentioning

confidence: 99%

The effect of pupillary dilatation on IOL power measurement by using the IOLMaster

2015

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The aim of this study is to assess the agreement of IOL power and ocular biometry measurements before and after pupillary dilatation by using the IOLMaster. This was the prospective nonrandomized cohort study. Measurements were taken with the IOLMaster (®) (Carl Zeiss Meditec AG, Jena, Germany) from healthy volunteers at the Department of Ophthalmology, King Chulalongkorn Memorial Hospital. Axial length (AL), keratometry both flattest and steepest (K1, K2), and anterior chamber depth (ACD) were measured before and after the dilatation of the pupil with 1 % tropicamide. The IOL power was calculated using the Sanders-Retzlaff-Kraff/Theoretical (SRK/T) formula. The mean difference of each parameter was assessed by Bland-Altman plot analysis. 384 eyes from 195 healthy volunteers were measured. The mean age of the patients was 52.39 ± 1.02 years (range 21-79). Pupillary dilatation had no significant effect on AL (p = 0.07), keratometry [steepest K (p = 0.95) and flattest K (p = 0.17)], and IOL power (Alcon SN60WF) (p = 0.40) obtained from the IOLMaster. However, ACD was significantly increased post-dilatation (p < 0.05). The Bland-Altman plot indicated good concordance in nearly all parameters except ACD. For ACD measurements, the 95 % limit of agreement between pre-dilatation and post-dilatation was -0.47 to 0.23 mm; therefore, 92.2 % of the measurement differences were with a LoA of -0.47 to 0.23 mm. There were no eyes that could not be measured by the IOLMaster. The dilatation of the pupil had no significant effect on AL, keratometry measurements, and SRK/T calculated IOL power. However, the ACD significantly increased post-dilatation.

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The Effect of Pharmacological Dilation on Calculation of Targeted and Ideal IOL Power Using Multivariable Formulas

et al. 2020

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Background: To examine the effect of pharmacologic dilation on biometric parameters measured by the Lenstar LS 900, and whether these changes affect the power of the calculated intraocular lens (IOL) using multivariable formulas in an undilated versus pharmacologically dilated state. Methods: Prospective study of 98 phakic eyes from 53 patients. Axial length (AL), central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT), and keratometry (K) readings were measured. The first set of measurements was taken prior to dilation. After dilation (pupil diameter C 6.0 mm), a second set of measurements was taken. The Barrett, Olsen, Hill-RBF, Haigis, SRK/T, and Holladay I formulas were used to calculate IOL power before and after dilation. Two calculation methods were used: method A used a commonly available IOL targeted to achieve the lowest myopic spheroequivalent residual refraction; method B calculated ideal IOL power for emmetropia. Results: Statistically significant increases were seen in CCT (p \ 0.01), ACD (p \ 0.01), and AL (p \ 0.01) whereas a statistically significant decrease was seen in LT (p \ 0.01) post dilation. Using method A, the percentage of eyes which would have received an IOL with 0.5 D or 1.0 D of higher power, if post-dilation measurements were used, were 25.5%, 30.6%, 20.4%, and 23.5% for Barrett, Olsen, Hill-RBF, and Haigis, respectively. Using method B, only Haigis and Olsen had a statistically significant increase in ideal IOL power. Conclusions: Pharmacologic dilation can be associated with an increase in non-custom IOL dioptric power when using multivariable formulas, which may lead to a myopic surprise.

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Effect of pupil dilation on the accuracy of the IOLMaster

Abstract: Dilating the pupil did not adversely affect the clinical accuracy of the IOLMaster.

Cited by 25 publications

References 9 publications

Effect of pharmacological pupil dilation on measurements and iol power calculation made using the new swept-source optical coherence tomography-based optical biometer

Effect of pharmacological pupil dilation on measurements and iol power calculation made using the new swept-source optical coherence tomography-based optical biometer

The effect of pupillary dilatation on IOL power measurement by using the IOLMaster

The Effect of Pharmacological Dilation on Calculation of Targeted and Ideal IOL Power Using Multivariable Formulas

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