Surgically induced astigmatism following single site and twin site phacotrabeculectomy augmented with mitomycin C

Summary Background The aim of the present study was to describe surgically induced astigmatism (SIA) and the coupling effect after conventional phacoemulsification cataract surgery (CPS) in relation to the incisional axis. Material and methods A total of 42 patients were included in the retrospective case series study. Corneal topography was obtained for patients with significant cataract before and 6 weeks after CPS with a main clear corneal incision size of 2.4 mm. Patients were grouped according to the relationship of the incisional axis to the position of the steep axis into a steep incisional group and a flat incisional group. Results In total, 46 eyes were included in the study. While the steep incisional group showed an SIA of −0.15 D (± 0.35), the flat incisional group had a significantly higher SIA of 0.20 D (± 0.51) (p = 0.03). The coupling ratio (CR) in the steep incisional group was −0.38 (± 1.41) and in the flat incisional group it was 0.16 (± 0.97). Correspondingly, a coupling constant (CC) of −0.25 was found for group 1 and a CC of 0.0 for group 2. Conclusion Our results suggest that the location of the main incision should be decided with consideration of the corneal astigmatism in order to minimize the SIA. The CR helps to understand the effect of induced astigmatism and the change in spherical equivalent.

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Surgically induced astigmatism after phacoemulsification in eyes with mild to moderate corneal astigmatism

Journal of Cataract & Refractive Surgery ◽

10.1016/j.jcrs.2005.12.104 ◽

2006 ◽

Vol 32 (4) ◽

pp. 565-572 ◽

Cited By ~ 36

Author(s):

Edmondo Borasio ◽

Jodhbir S. Mehta ◽

Vincenzo Maurino

Keyword(s):

Corneal Astigmatism ◽

Surgically Induced Astigmatism ◽

Induced Astigmatism ◽

Surgically Induced

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Surgically-Induced Astigmatism in Combined ECCE With Filtering Procedures Compared to ECCE Alone

Ophthalmic Surgery Lasers and Imaging Retina ◽

10.3928/1542-8877-19920201-04 ◽

1992 ◽

Vol 23 (2) ◽

pp. 81-84

Author(s):

Neil T Choplin ◽

John F Monroe

Keyword(s):

Surgically Induced Astigmatism ◽

Induced Astigmatism ◽

Surgically Induced

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Preliminary study of the association between corneal histocytological changes and surgically induced astigmatism after phacoemulsification

BMC Ophthalmology ◽

10.1186/1471-2415-14-134 ◽

2014 ◽

Vol 14 (1) ◽

Cited By ~ 4

Author(s):

Xing Du ◽

Guiqiu Zhao ◽

Qing Wang ◽

Xian Yang ◽

Ang Gao ◽

...

Keyword(s):

Surgically Induced Astigmatism ◽

Induced Astigmatism ◽

Preliminary Study ◽

Surgically Induced

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Astigmatism Correction during Femtosecond Laser-assisted Transepithelial Arcuate Keratotomy Using the Wound Open Method

Journal of the Korean Ophthalmological Society ◽

10.3341/jkos.2021.62.12.1592 ◽

2021 ◽

Vol 62 (12) ◽

pp. 1592-1599

Author(s):

Joon Kyo Chung ◽

Gyu Le Han ◽

Hoon Noh ◽

Dong Hui Lim ◽

Tae-Young Chung

Keyword(s):

Femtosecond Laser ◽

Medical Center ◽

Corneal Astigmatism ◽

Retrospective Survey ◽

Surgically Induced Astigmatism ◽

Open Method ◽

Astigmatism Correction ◽

Before And After ◽

Induced Astigmatism ◽

Surgically Induced

Purpose: The purpose of this study was to compare corneal astigmatism correction between “wound open” and “wound intact” methods during femtosecond laser-assisted transepithelial arcuate keratotomy.Methods: From April 2016 to December 2018, a retrospective survey was conducted on patients undergoing femtosecond laser cataract surgery at the Ophthalmology Department of Samsung Medical Center. Size comparison and vector analysis of corneal astigmatism before and after surgery were performed in the wound open and wound intact groups.Results: In the wound open and wound intact groups, the target-induced astigmatism (TIA) was 1.28 ± 0.55; and 1.26 ± 0.29 diopters, the surgically induced astigmatism (SIA) was 0.80 ± 0.52; and 0.53 ± 0.32 diopters, and the correction index (CI) was 0.63 ± 0.28; and 0.43 ± 0.26, respectively. The astigmatism correction was superior in the wound open group (p = 0.048, p = 0.025). In a subgroup with TIA < 1.2 diopters, there were no significant differences in SIA or CI between the two groups; however, in the subgroup with a TIA > 1.2 diopters, the SIA was 1.09 ± 0.59; and 0.54 ± 0.37 diopters and the CI was 0.60 ± 0.28; and 0.36 ± 0.23 in the wound open and wound intact groups, respectively (p = 0.022, p = 0.047). Thus, astigmatism correction was superior in the wound open group.Conclusions: The wound open method during femtosecond laser-assisted transepithelial arcuate keratotomy was superior for astigmatism correction compared to the wound intact method.

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Comparative study between conventional extra capsular cataract extraction versus manual small incision cataract surgery

International Journal of Research in Medical Sciences ◽

10.18203/2320-6012.ijrms20170650 ◽

2017 ◽

Vol 5 (3) ◽

pp. 996 ◽

Cited By ~ 1

Author(s):

Gannaram Laxmiprasad ◽

Chhaya Shori ◽

Rakesh Shori ◽

Ashalatha Alli

Keyword(s):

Cataract Surgery ◽

Tertiary Care ◽

Posterior Chamber ◽

Small Incision Cataract Surgery ◽

Visual Rehabilitation ◽

Surgically Induced Astigmatism ◽

Small Incision ◽

Significant Difference ◽

Induced Astigmatism ◽

Surgically Induced

Background: Recent reports indicate that both manual small incision cataract surgery and extra capsular cataract excision surgery with posterior chamber intraocular lens implantation are safe and effective for treatment of cataract surgery, however, manual small incision cataract surgery gives better uncorrected vision. Objectives of the study were to compare intraoperative and postoperative complications, to compare induced astigmatism and to compare the visual rehabilitation.Methods: This is a prospective study of 100 consecutive patients assigned to undergo conventional extra capsular cataract excision surgery (50 cases) and manual small incision cataract surgery (50 cases). Study was done for a period of two years at a tertiary care referral hospital. Institutional Ethics Committee permission was taken. Also the informed consent was obtained from each patient.Results: In conventional ECCE, the most common surgically induced astigmatism was WTR in 73.4% of cases with mean of 2.79 D±1.3 on first day. 70% of cases with mean 2.1 D±1.28 and 64% of cases with mean of 1.86 D±1.14 at six weeks. ATR was common in MSICS group, 83.67% of cases with mean of 1.5 D±0.72 on first day, 86% of cases with mean of 1.03 D±0.6 at one week and 88% of cases with mean of 1.27 D±0.81 at six weeks. The induced astigmatism was less in MSICS group compared to ECCE group at first day but after six weeks there was no much significant difference found. Early visual recovery was better in MSICS groupConclusions: MSICS has definitive advantages over conventional ECCE in terms of early visual rehabilitation, minimal surgically induced astigmatism; no suture related complications and reduced surgical time.

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Comparison of surgically induced astigmatism between anterior and total cornea in 2.2 mm steep meridian incision cataract surgery

BMC Ophthalmology ◽

10.1186/s12886-021-02131-x ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Young-chae Yoon ◽

Minji Ha ◽

Woong-Joo Whang

Keyword(s):

Cataract Surgery ◽

Intraocular Lens ◽

Corneal Surface ◽

Polar Plot ◽

Mean Values ◽

Surgically Induced Astigmatism ◽

Induced Astigmatism ◽

The Mean ◽

Surgically Induced ◽

Corneal Refractive Power

Abstract Background This study aimed to compare surgically induced astigmatism (SIA) on the anterior and total cornea during cataract surgery through a 2.2 mm steep meridian incision. Methods The study included 69 left eyes of 69 patients who had undergone cataract surgery. The 69 eyes were classified into three subgroups according to the preoperative steep meridian. Following phacoemulsification, an intraocular lens was inserted into the bag. The keratometric measurements were taken 12 months postoperatively, on the anterior cornea (automated keratometer and anterior keratometry [K] from a rotating Scheimpflug camera) and total cornea (equivalent K reading [EKR] 3.0 mm, EKR 4.5 mm, total corneal refractive power (TCRP) 2.0 mm ring, TCRP 3.0 mm zone, TCRP 4.0 mm zone). The SIA was analyzed for each parameter. Results On the double-angle polar plot, the summated vector mean values of SIA determined by the automated keratometer and Scheimpflug anterior K were 0.28 diopter (axis: 177°) and 0.37 diopter (axis: 175°) in with-the-rule (WTR) astigmatism; 0.03 diopter (axis: 156°) and 0.18 diopter (axis: 177°) in oblique astigmatism; 0.15 diopter (axis: 96°) and 0.17 diopter (axis: 73°) in against-the-rule (ATR) astigmatism. The mean SIAs on the total cornea ranged from 0.31 to 0.42 diopter in WTR astigmatism; from 0.16 to 0.27 diopter in oblique astigmatism; from 0.04 to 0.11 diopter in ATR astigmatism. Mean magnitude SIA ranged from 0.41 to 0.46 diopter on anterior corneal surface and 0.50 to 0.62 diopter on total cornea. J0 and J45 of the posterior cornea showed no significant changes after cataract surgery, and the changes in J0 and J45 did not show any statistical differences between the anterior and total cornea (all p > 0.05). Conclusions There were no differences in the summed vector mean values of SIA between the anterior cornea and the total cornea.

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