Correlation Between Central Corneal Thickness, Anterior Chamber Depth, and Corneal Keratometry as Measured by Oculyzer II and WaveLight OB820 in Preoperative Cataract Surgery Patients

Kanellopoulos, Anastasios John; Asimellis, George

doi:10.3928/1081597x-20121005-07

Cited by 29 publications

(18 citation statements)

References 24 publications

(25 reference statements)

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“…This finding is in agreement with the pupil diameter reduction (Figure 3A and B), which is also correlated with patient age. In other words, the findings suggest that with increasing patient age, there is more AC depth and volume increase – probably expected, as studies have indicated increased preoperative crystalline lens thickness,4 and thus the creation of more anterior segment “space.” The new finding herein is the associated pupil size reduction and shape improvement with age, as the pupil appears to reach a smaller diameter and more circular shape.…”

Section: Discussionmentioning

confidence: 67%

“…Ocular axial length was measured preoperatively in all cases by the WaveLight OB820 biometer (Alcon) 4. The OB820 is based on the Lenstar LS900 ® (Haag-Streit AG, Koeniz, Switzerland), a multifunctional, noncontact optical biometer employing a superluminescent diode laser centered at a wavelength of 820 nm.…”

Section: Methodsmentioning

confidence: 99%

“…As part of the standard clinical protocol of preoperative screening and postoperative follow-up assessment of cataract surgery patients,4 the authors employ Scheimpflug imaging for a number of reasons, such as nucleus staging and the recently available densitometry measurement of the crystalline lens and cornea 11. The rising importance of such measurements may become relevant to cataract surgeons practicing in countries where third-party payers may require documentation of a need for cataract surgery independent of, or in addition to, visual acuity or contrast sensitivity clinical measurements 12…”

Section: Introductionmentioning

confidence: 99%

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Clear-cornea cataract surgery: pupil size and shape changes, along with anterior chamber volume and depth changes. A Scheimpflug imaging study

Kanellopoulos

Asimellis

2014

OPTH

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PurposeTo investigate, by high-precision digital analysis of data provided by Scheimpflug imaging, changes in pupil size and shape and anterior chamber (AC) parameters following cataract surgery.Patients and methodsThe study group (86 eyes, patient age 70.58±10.33 years) was subjected to cataract removal surgery with in-the-bag intraocular lens implantation (pseudophakic). A control group of 75 healthy eyes (patient age 51.14±16.27 years) was employed for comparison. Scheimpflug imaging (preoperatively and 3 months postoperatively) was employed to investigate central corneal thickness, AC depth, and AC volume. In addition, by digitally analyzing the black-and-white dotted line pupil edge marking in the Scheimpflug “large maps,” the horizontal and vertical pupil diameters were individually measured and the pupil eccentricity was calculated. The correlations between AC depth and pupil shape parameters versus patient age, as well as the postoperative AC and pupil size and shape changes, were investigated.ResultsCompared to preoperative measurements, AC depth and AC volume of the pseudophakic eyes increased by 0.99±0.46 mm (39%; P<0.001) and 43.57±24.59 mm3 (36%; P<0.001), respectively. Pupil size analysis showed that the horizontal pupil diameter was reduced by −0.27±0.22 mm (−9.7%; P=0.001) and the vertical pupil diameter was reduced by −0.32±0.24 mm (−11%; P<0.001). Pupil eccentricity was reduced by −39.56%; P<0.001.ConclusionCataract extraction surgery appears to affect pupil size and shape, possibly in correlation to AC depth increase. This novel investigation based on digital analysis of Scheimpflug imaging data suggests that the cataract postoperative photopic pupil is reduced and more circular. These changes appear to be more significant with increasing patient age.

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Section: Discussionmentioning

confidence: 67%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Clear-cornea cataract surgery: pupil size and shape changes, along with anterior chamber volume and depth changes. A Scheimpflug imaging study

Kanellopoulos

Asimellis

2014

OPTH

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“…According to the visual optics calculations that we performed, 32 and assuming that the cornea is not subject to refractive change in the cataract surgery cases we examined, the pupil magnification factor of the apparent pupil was approximately 11.7% in the preoperative eyes (mean ACD 3.26 mm) 33 and 15.9% in the postoperative eyes (mean ACD 4.25 mm). These results are in contrast to those of, for example, a refractive intervention that alters the corneal anterior curvature (eg, photorefractive keratectomy, laser in situ keratomileusis), for which pupil magnification changes 34 can be attributed to changes in the corneal refractive power and not the ACD.…”

Section: Discussionmentioning

confidence: 99%

Digital pupillometry and centroid shift changes after cataract surgery

Kanellopoulos¹,

Asimellis²,

Georgiadou³

2015

Journal of Cataract and Refractive Surgery

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“…The combined Alcon/WaveLight refractive surgery laser platform comprising the FS200 femtosecond laser,18 the EX500 excimer laser, and a series of diagnostic networked devices that constitute the Refractive Suite ® (including Vario Placido topography, Oculyzer II Scheimpflug topometry imaging, and Tscherning Wavefront system) were used clinically 19…”

Section: Discussionmentioning

confidence: 99%

Topography-modified refraction (TMR): adjustment of treated cylinder amount and axis to the topography versus standard clinical refraction in myopic topography-guided LASIK

Kanellopoulos¹

2016

OPTH

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PurposeTo evaluate the safety, efficacy, and contralateral eye comparison of topography-guided myopic LASIK with two different refraction treatment strategies.SettingPrivate clinical ophthalmology practice.Patients and methodsA total of 100 eyes (50 patients) in consecutive cases of myopic topography-guided LASIK procedures with the same refractive platform (FS200 femtosecond and EX500 excimer lasers) were randomized for treatment as follows: one eye with the standard clinical refraction (group A) and the contralateral eye with the topographic astigmatic power and axis (topography-modified treatment refraction; group B). All cases were evaluated pre- and post-operatively for the following parameters: refractive error, best corrected distance visual acuity (CDVA), uncorrected distance visual acuity (UDVA), topography (Placido-disk based) and tomography (Scheimpflug-image based), wavefront analysis, pupillometry, and contrast sensitivity. Follow-up visits were conducted for at least 12 months.ResultsMean refractive error was −5.5 D of myopia and −1.75 D of astigmatism. In group A versus group B, respectively, the average UDVA improved from 20/200 to 20/20 versus 20/16; post-operative CDVA was 20/20 and 20/13.5; 1 line of vision gained was 27.8% and 55.6%; and 2 lines of vision gained was 5.6% and 11.1%. In group A, 27.8% of eyes had over −0.50 diopters of residual refractive astigmatism, in comparison to 11.7% in group B (P<0.01). The residual percentages in both groups were measured with refractive astigmatism of more than −0.5 diopters.ConclusionTopography-modified refraction (TMR): topographic adjustment of the amount and axis of astigmatism treated, when different from the clinical refraction, may offer superior outcomes in topography-guided myopic LASIK. These findings may change the current clinical paradigm of the optimal subjective refraction utilized in laser vision correction.

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Correlation Between Central Corneal Thickness, Anterior Chamber Depth, and Corneal Keratometry as Measured by Oculyzer II and WaveLight OB820 in Preoperative Cataract Surgery Patients

Cited by 29 publications

References 24 publications

Clear-cornea cataract surgery: pupil size and shape changes, along with anterior chamber volume and depth changes. A Scheimpflug imaging study

Clear-cornea cataract surgery: pupil size and shape changes, along with anterior chamber volume and depth changes. A Scheimpflug imaging study

Digital pupillometry and centroid shift changes after cataract surgery

Topography-modified refraction (TMR): adjustment of treated cylinder amount and axis to the topography versus standard clinical refraction in myopic topography-guided LASIK

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