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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 AJ, Asimellis G - Clin Ophthalmol (2014)

Bottom Line: 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.These changes appear to be more significant with increasing patient age.

View Article: PubMed Central - PubMed

Affiliation: Laservision.gr Eye Institute, Athens, Greece ; New York University School of Medicine, New York, NY, USA.

ABSTRACT

Purpose: To 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 methods: The 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.

Results: Compared 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 mm(3) (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.

Conclusion: Cataract 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.

No MeSH data available.


Related in: MedlinePlus

A fitted line plot of anterior chamber volume change, expressed as a percentage of the preoperative value, as a result of cataract surgery (n=86 eyes) versus patient age.Abbreviations: AC, anterior chamber; CI, confidence interval; PI, prediction interval; R-sq, coefficient of determination; R-sq (adj), adjusted coefficient of determination; S, sum of residuals; vol, volume.
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f2-opth-8-2141: A fitted line plot of anterior chamber volume change, expressed as a percentage of the preoperative value, as a result of cataract surgery (n=86 eyes) versus patient age.Abbreviations: AC, anterior chamber; CI, confidence interval; PI, prediction interval; R-sq, coefficient of determination; R-sq (adj), adjusted coefficient of determination; S, sum of residuals; vol, volume.

Mentions: Table 3 summarizes the preoperative versus postoperative values for specific anterior segment parameters (AC depth, AC volume, and CCT) measured in group A by the Scheimpflug device. CCT was 538.70±41.49 (439–616) μm preoperatively and 544.57±44.39 (432–634) μm postoperatively (P=0.3724). AC depth and volume significantly increased. AC depth was 3.26±0.43 (2.34–4.15) mm pre-operatively and 4.25±0.42 (3.20–5.25) mm postoperatively (P<0.001). AC volume was 149.79±43.00 (62–240) mm3 preoperatively and 193.70±30.29 (127–269) mm3 postoperatively (P<0.001). Figure 2 illustrates AC volume change, expressed as a percentage of the preoperative value, as a result of cataract surgery in the form of a fitted line plot versus patient age.


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

Kanellopoulos AJ, Asimellis G - Clin Ophthalmol (2014)

A fitted line plot of anterior chamber volume change, expressed as a percentage of the preoperative value, as a result of cataract surgery (n=86 eyes) versus patient age.Abbreviations: AC, anterior chamber; CI, confidence interval; PI, prediction interval; R-sq, coefficient of determination; R-sq (adj), adjusted coefficient of determination; S, sum of residuals; vol, volume.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4216028&req=5

f2-opth-8-2141: A fitted line plot of anterior chamber volume change, expressed as a percentage of the preoperative value, as a result of cataract surgery (n=86 eyes) versus patient age.Abbreviations: AC, anterior chamber; CI, confidence interval; PI, prediction interval; R-sq, coefficient of determination; R-sq (adj), adjusted coefficient of determination; S, sum of residuals; vol, volume.
Mentions: Table 3 summarizes the preoperative versus postoperative values for specific anterior segment parameters (AC depth, AC volume, and CCT) measured in group A by the Scheimpflug device. CCT was 538.70±41.49 (439–616) μm preoperatively and 544.57±44.39 (432–634) μm postoperatively (P=0.3724). AC depth and volume significantly increased. AC depth was 3.26±0.43 (2.34–4.15) mm pre-operatively and 4.25±0.42 (3.20–5.25) mm postoperatively (P<0.001). AC volume was 149.79±43.00 (62–240) mm3 preoperatively and 193.70±30.29 (127–269) mm3 postoperatively (P<0.001). Figure 2 illustrates AC volume change, expressed as a percentage of the preoperative value, as a result of cataract surgery in the form of a fitted line plot versus patient age.

Bottom Line: 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.These changes appear to be more significant with increasing patient age.

View Article: PubMed Central - PubMed

Affiliation: Laservision.gr Eye Institute, Athens, Greece ; New York University School of Medicine, New York, NY, USA.

ABSTRACT

Purpose: To 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 methods: The 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.

Results: Compared 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 mm(3) (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.

Conclusion: Cataract 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.

No MeSH data available.


Related in: MedlinePlus