Evaluation of corneal topographic changes and surgically induced astigmatism after transconjunctival 27-gauge microincision vitrectomy surgery

Tekin, Kemal; Sönmez, Kenan; İnanç, Merve; Ozdemir, Kubra; Göker, Yasin Şakir; Yılmazbaş, Pelin

doi:10.1007/s10792-017-0507-5

Cited by 7 publications

(13 citation statements)

References 28 publications

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“…[16,17] In contrast, many other reports have stated that there were no changes in the postoperative corneal shape that occurred when using 23-, 25-, and 27-gauge small incision vitrectomy. [1][2][3][4][5] In our current study, changes in the higher-order irregular astigmatism component of the corneal shape were even transiently observed in the nongas group on the day after the operation. However, it should be noted that differences associated with the corneal shape measuring devices used may have contributed to this result.…”

Section: Discussionsupporting

confidence: 53%

“…In recent years, numerous corneal shape measuring apparatuses have been developed, including the Placido disk type corneal shape analysis, Scheimpflug-type corneal shape analysis, and anterior ocular optical coherence tomography (OCT). [ 3 ] Each corneal shape measuring apparatus has its own unique characteristics. As corneal shape measurements using anterior segment OCT are less affected by the condition of the tear film, this method is suitable for use in accurately measuring the postoperative corneal shape, since the postoperative tear film condition has been shown not to be stable.…”

Section: Introductionmentioning

confidence: 99%

“…However, at the present time there have yet to be many reports that have analyzed the posterior corneal shape changes after vitrectomy. [ 3 ]…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corneal shape changes after vitreoretinal surgery with fluid–gas exchange

Watanabe¹,

Ninomiya²,

Mizobuchi³

et al. 2022

Medicine

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To investigate changes in the corneal shape caused by fluid-gas exchange after vitrectomy.This retrospective case-control study included 43 eyes that underwent a combination of cataract surgery and vitrectomy. The corneal shape was measured using anterior segment optical coherence tomography CASIA2. The corneal shape measurements were performed preoperatively, 1 day, 1 week, 1 month, and 3 months after surgery. After calculating the real K value from the actual measured values of the posterior shape of the corneal refracting power and the single posterior corneal refracting power value, Fourier analysis values were examined. Fluid-gas exchange was performed in 23 eyes (gas group), while it was not performed in 20 eyes (nongas group).There was a significant increase in the real K value in the regular and asymmetry components (0.61 ± 0.36, 0.82 ± 0.64) in the gas group only on the first day after surgery (Steel-Dwass test; P < .05). There was also a significant increase in the real K value in the higher-order irregular astigmatism components (Steel-Dwass test; P < .05) for longer periods in the gas versus the nongas group. The shape of the posterior cornea increased in all components in the gas group on the first day after surgery (spherical power À6.35 ± 0.20, regular astigmatism 0.32 ± 0.12, asymmetry 0.22 ± 0.13, and higher-order irregular astigmatism 0.12 ± 0.05, Steel-Dwass test; P < .05).Postoperative changes caused by surgical invasion in the corneal shape appeared to be greater in the gas versus the nongas group, in addition to affecting the time periods of the postoperative corneal shape changes.

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Section: Discussionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

“…However, at the present time there have yet to be many reports that have analyzed the posterior corneal shape changes after vitrectomy. [ 3 ]…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Corneal shape changes after vitreoretinal surgery with fluid–gas exchange

Watanabe¹,

Ninomiya²,

Mizobuchi³

et al. 2022

Medicine

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show abstract

“…It has been well documented in the literature that utilization of smaller-diameter instruments with self-sealing, transconjunctival scleral wounds provide some advantages such as decreased postoperative pain and inflammation, decreased induced astigmatism, and improved patient comfort. [2][3][4][5] On the other hand, despite these improvements, some complications are still available following PPV in which cataract development or acceleration is one of the most common.…”

Section: Introductionmentioning

confidence: 99%

The quantitative assessment of alterations in lens transparency after transconjunctival 27-gauge microincision vitrectomy surgery

Tekin

İnanç

Ozdemir

et al. 2017

Eye

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PurposeTo evaluate the baseline and post-vitrectomy lens densitometry values by a Scheimpflug camera in eyes with epiretinal membrane that were treated with 27-G microincision vitrectomy surgery (MIVS) without tamponade and to compare the results with those in fellow healthy eyes.Patients and methodsProspective case series. The lens densitometry measurements of 24 patients, who underwent 27-G MIVS without any tamponade for the treatment of epiretinal membrane, were taken preoperatively and on the first week, first month, and third month postoperatively with Pentacam HR-Scheimpflug imaging system.ResultsThe mean lens densitometry values at Zone 1 and average lens densitometry values significantly increased in the study eyes on the first month when compared with the preoperative values (P=0.011, P=0.033, respectively). Additionally, there were statistically significant differences regarding the mean lens densitometry values of Zone 1 and Zone 2, and also average lens densitometry values between the preoperative and third month postoperative values (P=0.003, P=0.021, P=0.009, respectively). However, the densitometry values of fellow eyes were similar at preoperatively and all the postoperative follow-up periods (P>0.05 for all).ConclusionsThis study suggests that 27-G MIVS might cause post-surgical lens density changes even in early postoperative months and vitreous may play an important role in protecting the transparency of the lens.

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Surgical outcomes of 27-gauge and 25-gauge vitrectomy day surgery for proliferative diabetic retinopathy

Naruse¹,

Shimada

Mori

2018

Int Ophthalmol

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Evaluation of corneal topographic changes and surgically induced astigmatism after transconjunctival 27-gauge microincision vitrectomy surgery

Abstract: Minor corneal surface and induced astigmatic changes are expected to result in rapid visual rehabilitation after pars plana vitrectomy with the 27-g MIVS system.

Cited by 7 publications

References 28 publications

Corneal shape changes after vitreoretinal surgery with fluid–gas exchange

Corneal shape changes after vitreoretinal surgery with fluid–gas exchange

The quantitative assessment of alterations in lens transparency after transconjunctival 27-gauge microincision vitrectomy surgery

Surgical outcomes of 27-gauge and 25-gauge vitrectomy day surgery for proliferative diabetic retinopathy

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