Calculating the surgically induced refractive change following ocular surgery

Holladay, Jack T.; Cravy, Thomas V.; Koch, Douglas D.

doi:10.1016/s0886-3350(13)80095-8

Cited by 288 publications

(158 citation statements)

References 2 publications

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“…SIA was calculated by the difference between the pre-and postoperative astigmatism by the rectangular coordinate method using the Holladay-Cravy-Koch formula. 11 The preoperative readings were measured within 4 weeks before the operation and postoperative readings were measured at 3 months after the operation. Surgically induced corneal topographic changes were analysed by evaluating 12 points situated at 1.5 mm from the centre of the cornea, corresponding a 3.0 mm optical zone.…”

Section: Methodsmentioning

confidence: 99%

Surgically induced astigmatism in phacoemulsification, pars plana vitrectomy, and combined phacoemulsification and vitrectomy: a comparative study

Yuen

Cheung

Tsang

et al. 2008

Eye

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Purpose To study the surgically induced astigmatism (SIA) in combined phacoemulsification and vitrectomy, and compare with that when either procedure is performed alone. Methods This is a prospective comparative interventional trial comprising of 60 eyes of 60 consecutive patients with cataract and/or vitreo-retinal pathology. They were divided equally into three groups based on the type of procedure: Group A, phacoemulsification alone group, using a 3.0-3.2 mm wide unsutured sclero-corneal tunnel incision at 1.0 mm post-limbus at 10 o'clock; Group B, par plana vitrectomy alone group, using three sclerotomies at 3.5 mm post-limbus at 2, 8, and 10 o'clock (right eye) or at 2, 4, and 10 o'clock (left eye) positions; and Group C, combined phacoemulsification and pars plana vitrectomy group. Main outcome measures were the amplitude (K-induced) and the axis of SIA calculated by rectangular coordinate method using the Holladay-Cravy-Koch formula.Results The mean K-induced amplitudes were 0.19±0.14 D, 0.17±0.11 D, and 0.23 ± 0.19 D for groups A, B, and C, respectively. The range of K-induced amplitudes for the entire cohort was 0.00-0.77 D. No overall statistically significant differences in the pre-and postoperative topographic astigmatism amplitudes and the K-induced between groups A, B, and C were found (all P40.05). Minor shifts, of doubtful clinical significance, in the axes of SIA were present. Conclusions Combined phacoemulsification and pars plana vitrectomy does not induce significant astigmatic change per se, and its amount is similar to that when either procedure is performed alone.

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Section: Methodsmentioning

confidence: 99%

Surgically induced astigmatism in phacoemulsification, pars plana vitrectomy, and combined phacoemulsification and vitrectomy: a comparative study

Yuen

Cheung

Tsang

et al. 2008

Eye

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“…4 This is an example of patients presenting with the majority of the pre-operative astigmatism being lenticular in origin and developing as the lenticular opacities progressed. Such a large amount of lenticular astigmatism due to cataract is not infrequently seen, even in our experience, in the absence of vast amounts of nuclear sclerosis.…”

Section: Commentmentioning

confidence: 99%

Cataract presenting as manifest refractive astigmatism: case study

Rayside

Spokes

Barber

et al. 2007

Eye

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Sir, Cataract presenting as manifest refractive astigmatism: case study Refractive errors have been well described in association with cataract, most commonly in the form of myopic progression with nuclear sclerosis. 1 We present the following cases of patients with cataracts presenting as manifest refractive astigmatism secondary to lenticular astigmatism, in turn due to posterior subcapsular and nuclear sclerotic cataracts.

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“…With IOLMaster keratometric readings, SIA consisting of astigmatic amplitude and axis was calculated by the difference between the preoperative and postoperative astigmatism by the rectangular coordinate method using the Holladay-Cravy-Koch formula. 15 In the toric IOL group, the IOL axis was measured using the vertical arm readings of the slit lamp (Haag-Streit BQ-900; Bern, Switzerland) through dilated pupil with tropicamide. A thin coaxial slit was projected in front of the eye and rotated until the thin slit projection overlapped the axis marks of the toric IOL.…”

Section: Postoperative Evaluationsmentioning

confidence: 99%

Combined 23-gauge microincisonal vitrectomy surgery and phacoemulsification with AcrySof toric intraocular lens implantation: a comparative study

Park

Shin

Kim

2011

Eye

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Aim To compare AcrySof toric intraocular lens (IOL) and non-toric IOL in patients who had combined 23-gauge microincisional vitrectomy surgery (MIVS) and phacoemulsification for vitreoretinal diseases and cataract with pre-existing corneal astigmatism. Methods This is a prospective comparative study comprised of 30 patients (30 eyes) who had combined 23-gauge MIVS and phacoemulsification for vitreoretinal diseases and cataract with pre-existing regular corneal astigmatism greater than 1 diopters (D). In all, 15 eyes had AcrySof toric IOL (Alcon Laboratories) and 15 eyes had non-toric IOL (Akreos AO MI60; Bausch & Lomb) implantation. Main outcome measures were uncorrected visual acuity (UCVA), refractive cylinder, surgically induced astigmatism (SIA), and IOL misalignment during 6 months. Results The mean UCVA of the toric IOL group was better than the non-toric IOL group at postoperative months 1, 3, and 6 (Po0.001, respectively). The mean absolute residual refractive cylinder of the toric IOL group at postoperative week 1, and months 1, 3, and 6 was less than the non-toric IOL group (P ¼ 0.008, o0.001, o0.001, and o0.001, respectively). There was no difference in the mean SIA between the two groups (P40.05, respectively). The mean toric IOL axis rotation was 3.52±2.751, which was within 51 in 66.7% of the toric IOL group and within 101 in 100%.Conclusions Combined 23-gauge MIVS and phacoemulsification with AcrySof toric IOL implantation is an effective method of correcting vitreoretinal diseases and cataract and pre-existing corneal astigmatism, and the toric IOL showed good rotational stability, even in vitrectomized eyes for 6 months.

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Calculating the surgically induced refractive change following ocular surgery

Cited by 288 publications

References 2 publications

Surgically induced astigmatism in phacoemulsification, pars plana vitrectomy, and combined phacoemulsification and vitrectomy: a comparative study

Surgically induced astigmatism in phacoemulsification, pars plana vitrectomy, and combined phacoemulsification and vitrectomy: a comparative study

Cataract presenting as manifest refractive astigmatism: case study

Combined 23-gauge microincisonal vitrectomy surgery and phacoemulsification with AcrySof toric intraocular lens implantation: a comparative study

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