Surgically induced astigmatism and refractive outcomes following phacotrabeculectomy

Senthil, Sirisha; Deshmukh, Sanket P; Turaga, Kiranmaye; Pesala, Veerendranath; Bandela, Praveen K.; Jonnadula, Ganesh Babu; Garudadri, Chandra S.

doi:10.4103/ijo.ijo_588_19

Cited by 3 publications

(4 citation statements)

References 26 publications

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“…Differences in refractive behaviour across eyes and between individuals38 39 44 67 73 114 128 are of importance in analyses of dioptric power and the following briefly considers some methods towards qualitatively and quantitatively analysing anisometropia 44 67 73. Anisometropia and aniso-astigmatism are often a consequence of conditions such as keratoconus69 70 85 86 105 123 but can also be an important consideration in refractive42–44 74 87 125 or other surgeries42–44 87–113 sometimes involving IOL36 41–43 45 46 85 99–104 or other implants 89–92 105. Reliability and reproducibility of measures of refractive behaviour are integral to understanding anisometropia 40 57–64 66 109 120–123.…”

Section: Resultsmentioning

confidence: 99%

“… 96–109 Given the diversity of human response and healing, satisfactory statistical methods are necessary to make correct decisions and advance surgical and other methods of treatment (eg, genetic or drug-related) for such ophthalmic conditions and diseases. Surgical treatments for glaucoma 110 or other retinal anomalies such as retinal detachment, strabismus, 111 112 or eyelid disorders 113 also affect refractive behaviour with changes in astigmatism specifically.…”

Section: A Brief Review Of Clinical Applications Using Effective Anal...mentioning

confidence: 99%

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Dioptric power and refractive behaviour: a review of methods and applications

2022

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Myopia is a global healthcare concern and effective analyses of dioptric power are important in evaluating potential treatments involving surgery, orthokeratology, drugs such as low-dose (0.05%) atropine and gene therapy. This paper considers issues of concern when analysing refractive state such as data normality, transformations, outliers and anisometropia. A brief review of methods for analysing and representing dioptric power is included but the emphasis is on the optimal approach to understanding refractive state (and its variation) in addressing pertinent clinical and research questions.Although there have been significant improvements in the analysis of refractive state, areas for critical consideration remain and the use of power matrices as opposed to power vectors is one such area. Another is effective identification of outliers in refractive data. The type of multivariate distribution present with samples of dioptric power is often not considered. Similarly, transformations of samples (of dioptric power) towards normality and the effects of such transformations are not thoroughly explored. These areas (outliers, normality and transformations) need further investigation for greater efficacy and proper inferences regarding refractive error. Although power vectors are better known, power matrices are accentuated herein due to potential advantages for statistical analyses of dioptric power such as greater simplicity, completeness, and improved facility for quantitative and graphical representation of refractive state.

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Section: Resultsmentioning

confidence: 99%

Section: A Brief Review Of Clinical Applications Using Effective Anal...mentioning

confidence: 99%

Dioptric power and refractive behaviour: a review of methods and applications

2022

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“…A recent publication showed that the Orbscan II was useful for checking the surgically induced astigmatism after phacotrabeculectomy. [ 17 ] Thus, there is no unequivocal reason to question the Orbscan astigmatic computations. The results show that astigmatism was more pronounced at the posterior surface.…”

Section: Discussionmentioning

confidence: 99%

“…[ 29 ] Orbscan is a reliable technique for the evaluation of the cornea and has been successfully used to refine the ablation profiles during LASIK, assess displacement of corneal surfaces after kerato-refractive procedures, monitor ectasia, and show ethnic differences in the incidence of keratoconus and monitor astigmatic changes after phacotrabeculectomy. [ 17 30 31 32 33 34 35 36 ]…”

Section: Discussionmentioning

confidence: 99%

The influence of routine uncomplicated phacoemulsification on the orthogonality of the cornea

Tutchenko

Patel

Voytsekhivskyy

et al. 2021

Indian J Ophthalmol

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Purpose: The aim of this study was to determine the effect of routine uncomplicated phacoemulsification on the orthogonal distribution of mass within the central optical zone of the cornea. Methods: Astigmatism at both corneal surfaces was evaluated using Orbscan II (Bausch &and Lomb) before and up to 3 months after routine phacoemulsification (one eye/patient). The data were subjected to vector analysis to estimate the pre-and postoperative total astigmatism of the cornea (TCA). Results: Reporting the chief findings in minus cylinder (diopters, DC) over the central 3 mm (A) and 5 mm (B) optical zones. Mean TCA powers (±sd) at pre- and 3-months postop were A) –4.45DC (±2.00) and –5.69DC (±2.69), B) –2.91DC (±2.22) and –2.71DC (±1.60). Change in mean power was significant over 3 mm ( P < 0.01, n = 49) but not over 5 mm. Inter-zonal differences were significant ( P < 0.01). There was a significant linear relationship between the change in TCA power ( y = preoperative-postoperative) and TCA at preoperative stage (x) where, A) y = 0.45x + 3.12 ( r = 0.336, n = 49, P = 0.018), B) y = x + 2.65 ( r = 0.753, n = 49, P = <0.01). Over the central 3 mm zone only, change (preoperative-postoperative) in axis (°) of TCA (y 1 ) was significantly associated with TCA axis at preoperative stage (x 1 ) where y 1 = 1.391x 1 -0.008x 1 2 -0.701 ( r = 0.635, n = 49, P < 0.01). Conclusion: Changes in TCA power and axis at 3 months postop, determined using Orbscan II, are indicative of orthogonal alterations in the distribution of corneal tissue. Over the central 3 mm zone, the association between y 1 and x 1 shows that a change in TCA axis is more profound when preoperative axis is near 90° i.e., against-the-rule.

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No Changes in Keratometry Readings and Anterior Chamber Depth after XEN Gel Implantation in Patients with Glaucoma

Tatti,

Tronci,

Lixi

et al. 2024

JCM

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Background: This study aimed to compare keratometry and anterior chamber depth (ACD) changes after XEN implantation in primary open-angle glaucoma (POAG) cases over a 3-month follow-up period. Methods: Twenty patients with POAG who underwent XEN63 implantation, either standalone or combined with cataract surgery, were included. Preoperative data, including best-corrected visual acuity (BCVA), refraction, gonioscopy, ophthalmoscopy, intraocular pressure (IOP) evaluation, and axial length, were collected. Corneal topography and ACD measurements were assessed preoperatively and at postoperative days 1, 7, 15, 30, 60, and 90. Each patient’s eye that underwent XEN surgery was included in the study group, with the fellow eye serving as a control. Results: In the study group, there was a significant decrease in IOP after XEN stent implantation at all investigated time intervals (p < 0.05). However, changes in mean ACD did not show statistically significant differences at any follow-up examination in both the study and control groups. Additionally, keratometry readings revealed no significant changes in total astigmatism or steep keratometry values in either group. Conclusions: XEN implantation in POAG cases resulted in a significant decrease in IOP over the 3-month follow-up period. However, there were no significant changes observed in mean ACD or keratometry readings, indicating stability in these parameters post-XEN implantation. These findings suggest that XEN implantation may be an effective option for IOP reduction without affecting corneal curvature or ACD in POAG patients.

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Surgically induced astigmatism and refractive outcomes following phacotrabeculectomy

Cited by 3 publications

References 26 publications

Dioptric power and refractive behaviour: a review of methods and applications

Dioptric power and refractive behaviour: a review of methods and applications

The influence of routine uncomplicated phacoemulsification on the orthogonality of the cornea

No Changes in Keratometry Readings and Anterior Chamber Depth after XEN Gel Implantation in Patients with Glaucoma

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