Assessment of bilateral pupillary centroid characteristics at varying illuminations and post‐photopic flash response using an automated pupillometer

Prakash, Gaurav; Srivastava, Dhruv; Suhail, Muhammad; Bacero, Ruthchel

doi:10.1111/cxo.12409

Cited by 13 publications

(15 citation statements)

References 35 publications

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“…All scans were centered on the center of the pupil. Mesopic pupil diameter was acquired in a dark room with the disc illuminated in a manner to bring ambient light intensity to 4.0 lux as advised by the manufacturer [22].…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Corneal Higher-Order Aberrations by Scheimpflug–Placido Topography in Patients with Different Refractive Errors: A Retrospective Observational Study

Anbar

Mostafa

Elhawary

et al. 2019

Journal of Ophthalmology

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Purpose. To report the characteristics of anterior and posterior corneal high-order aberrations in patients with different refractive errors. Setting. This study was conducted at Sohag Refractive Center, Sohag, Egypt. Design. This is a retrospective observational study. Methods. This study evaluated 750 patients (750 eyes) who were seeking refractive surgery. The eyes were stratified into five groups (150 eyes/group) based on refractive error: mild-to-moderate myopia, high myopia, hyperopia, simple myopic astigmatism, and simple hypermetropic astigmatism. All patients were subjected to comprehensive ophthalmological examination including corneal topography and corneal aberrometry using the Scheimpflug–Placido topography (Sirius, CSO, Italy). Results. Coma aberration was statistically significant when compared in all five groups (P=0.01). It was highest in the hypermetropia group (0.26 ± 0.12 μm) but lower in the moderate myopia, high myopia, myopic astigmatism, and hypermetropic astigmatism groups. Spherical aberration was lowest in the hypermetropia group and significantly different from that in the other groups. Trefoil was statistically insignificant when all groups were compared (P=0.062) but was highest in the myopic astigmatism group (0.24 ± 0.25 μm). Total RMS peaked in the hypermetropia group (0.99 ± 0.70). Conclusions. In normal corneas and regular refractive errors, the cornea-induced high-order aberration was minimal, and all types of refractive errors were associated with certain types of high-order aberrations, with a significant increase in spherical aberration in the hypermetropia group.

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Section: Methodsmentioning

confidence: 99%

Evaluation of Corneal Higher-Order Aberrations by Scheimpflug–Placido Topography in Patients with Different Refractive Errors: A Retrospective Observational Study

Anbar

Mostafa

Elhawary

et al. 2019

Journal of Ophthalmology

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“…Mesopic pupil diameter was acquired in a semi-dark room with the disc illuminated in a manner to bring the ambient light intensity to 4.0lux as advised by the manufacturer [14]. The patient's eye was aligned along the visual axis using a central fixation light.…”

Section: Methodsmentioning

confidence: 99%

Inter-changeability Between Anterior Segment Optical Coherence Tomography and Scheimpflug Imaging in the Evaluation of Corneal Opacity

Mounir¹,

Abdellah²,

Zidan³

et al. 2022

TOOPHTJ

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Purpose To compare the results of corneal evaluation, either the total corneal thickness and corneal opacity depth by both technologies AS- OCT and Scheimpflug imaging by Sirius Scheimpflug placido topography. Methods sixty-eight eyes of sixty- eight consecutive patients with corneal opacities were examined by both AS-OCT and Sirius Scheimpflug imaging. Corneal thickness and corneal opacity depth were measured and compared determining the interchangeability using Bland–Altman plotting. Results Total corneal thickness was (470.32±62.10) and (463.47±56.47) by AS. OCT and Sirius Scheimpflug imaging, respectively (P value = 0.8). While the actual measurement of corneal opacity, corneal opacity depth was (135.39±119) and (85.45±128) by AS-OCT and Siris Scheimpflug imaging respectively with P value (0.004). Conclusion AS-OCT and Scheimpflug imaging Sirius may be used interchangeably for measuring both total corneal thickness, while in the determination of corneal opacity depth. the AS-OCT is superior to Scheimpflug imaging in the accuracy of determination of actual boundaries of the corneal opacity.

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“…This allows for the examination of the instant reactions and re-dilatation of the pupil in conditions ranging from photopic to scotopic illumination. 21 Pupil diameters were evaluated at seconds 0, 1, 2, 4, 6, 8, and 10. Sample output of static and dynamic pupillography is given in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

“…According to the lighting conditions set in the device, scotopic pupil images were recorded at 0.4 Lux illumination, mesopic images at 4 Lux illumination, and photopic images at 40 Lux illumination. 21 LED lighting was the light source in the room, and lighting conditions were tested and adjusted using a photometer. The patient was asked to open both eyes, not focus on the LED source or any point inside, and look straight ahead to avoid accommodation during shooting.…”

Section: Pupillographymentioning

confidence: 99%

Static and dynamic pupillary characteristics in multiple sclerosis

Muhafız

Bozkurt

Erdoğan

et al. 2021

European Journal of Ophthalmology

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Purpose: To examine the static and dynamic pupillary functions with automated pupillography in multiple sclerosis (MS) patients with preserved visual acuity. Methods: Forty-seven MS patients with preserved visual acuity were included in the study group and 43 healthy volunteers in the control group. The visual evoked potential of the patients was obtained. After routine ophthalmologic examination contrast sensitivity and the retinal nerve fiber layer (RNFL) thickness were measured. Finally scotopic, mesopic, and photopic pupillographies followed by dynamic pupillography were undertaken, and the pupillary dilatation speed was calculated. Results: The contrast sensitivity and RNFL thickness of the MS group were significantly lower than those of the control group ( p < 0.05; for both). In the MS and control groups, the scotopic pupil diameters were 5.48 ± 1.03 and 5.28 ± 0.78 mm, mesopic pupil diameters were 4.82 ± 0.83 and 4.48 ± 0.70 mm, and photopic pupil diameters were 3.84 ± 0.79 and 3.42 ± 0.49 mm, respectively ( p = 0.315, p = 0.044, and p = 0.004, respectively). In dynamic pupillography, the pupil in the MS group was more dilated than control group at all time sections examined except the sixth second ( p < 0.05; for all). Although the mean pupillary dilation speed in the first second was higher in the MS group ( p = 0.044), there was no significant difference between the groups for the other time intervals examined ( p > 0.05; for all). There was no correlation between pupillary parameters and P100-wave latency, RNFL thickness, or contrast sensitivity ( p > 0.05; for all). Conclusions: Static and dynamic pupillary functions may be affected in MS patients with preserved visual acuity. Although scotopic pupillary functions are preserved, mesopic, and photopic pupil functions are weakened.

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Assessment of bilateral pupillary centroid characteristics at varying illuminations and post‐photopic flash response using an automated pupillometer

Abstract: Fellow eye symmetry is seen in illumination-governed centroid shifts and the post-flash re-dilatation response. The pupil dilates back briskly with a time-dependent cubic function, which is similar for fellow eyes in normal patients.

Cited by 13 publications

References 35 publications

Evaluation of Corneal Higher-Order Aberrations by Scheimpflug–Placido Topography in Patients with Different Refractive Errors: A Retrospective Observational Study

Evaluation of Corneal Higher-Order Aberrations by Scheimpflug–Placido Topography in Patients with Different Refractive Errors: A Retrospective Observational Study

Inter-changeability Between Anterior Segment Optical Coherence Tomography and Scheimpflug Imaging in the Evaluation of Corneal Opacity

Static and dynamic pupillary characteristics in multiple sclerosis

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