Effect of corneal refractive surgery on optical coherence tomography measurements

Shpak, A.A.; Костенев, С. В.; Mushkova, I. A.; Коробкова, М. В.

doi:10.17116/oftalma201813405148

Cited by 7 publications

(4 citation statements)

References 25 publications

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“…Earlier, the authors showed in another study that a change in refractive power after laser-assisted in situ keratomileusis as large as 7.0 D produced minimal changes in average pRNFL of just 1 μm. 26 In conclusion, OCT instruments from most manufacturers do not consider the effect of refractive errors, especially of a high degree, on quantitative measurements of pRNFL. For the correct interpretation of the measurements of pRNFL in such patients, an original table was proposed, which provides a quick assessment of the results obtained on the Cirrus HD-OCT device.…”

Section: Discussionmentioning

confidence: 98%

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Evaluation of Average Retinal Nerve Fiber Layer Measurement in Eyes with Refractive Errors

Shpak¹,

Коробкова²

2021

Optom Vis Sci

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SIGNIFICANCE: Optical coherence tomography (OCT) measurements of peripapillary retinal nerve fiber layer (pRNFL) play an important role in the diagnosis of glaucoma and optic atrophy. However, the interpretation of these measurements in patients with refractive errors, especially of a high degree, presents great difficulties. Optical coherence tomography instruments from most manufacturers do not take into account the effect of refractive errors, especially of a high degree, on quantitative measurements of pRNFL. PURPOSE:The aim of this study was to develop a simple and easy method for evaluation of average pRNFL in eyes with refractive errors.METHODS: Average pRNFL was measured by Cirrus HD-OCT (Carl Zeiss Meditec Inc., Dublin, CA) in 183 healthy White subjects (183 eyes) older than 40 years, with an axial length of the eye from 22.5 to 24.5 mm and spherical equivalent of refraction from −1.63 to 2.0 D. RESULTS:For an average pRNFL, normative database of eyes with refraction close to emmetropia was constructed. The calculated first and fifth percentiles for age groups 41 to 50, 51 to 60, 61 to 70, and 71 to 85 years were 81 and 83, 79 and 81, 78 and 80, and 76 and 79 μm, respectively. Littmann-Bennett formula was modified to calculate a table containing first and fifth percentiles for eyes with axial lengths of 19 to 30 mm in the same age groups.CONCLUSIONS: For the correct interpretation of the measurements of pRNFL in patients with refractive errors, an original table was proposed, which provides a quick assessment of the results obtained on the Cirrus HD-OCT device. The proposed new formulas make it easy to calculate a similar table for any optical coherence tomography device using existing databases or after collecting a normative database of eyes with refraction close to emmetropia.

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Section: Discussionmentioning

confidence: 98%

“…However, this difference could not influence pRNFL data. Earlier, the authors showed in another study that a change in refractive power after laser-assisted in situ keratomileusis as large as 7.0 D produced minimal changes in average pRNFL of just 1 μm 26 …”

Section: Discussionmentioning

confidence: 99%

Evaluation of Average Retinal Nerve Fiber Layer Measurement in Eyes with Refractive Errors

Shpak¹,

Коробкова²

2021

Optom Vis Sci

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“…In Table 5 of our manuscript, we discussed 7 papers that studied RNFL changes after refractive surgery. [4][5][6][7][8][9][10] We carefully reviewed them again, and we found that none of the 7 papers adjusted the axial length after refractive surgery. Furthermore, our findings are in agreement with those of 7 studies, which also did not find any significant changes in RNFL thickness after refractive surgery.…”

mentioning

confidence: 99%

“…Shpak AA et al found that in patients with very high myopia, a decrease of over 10 diopters (D) in corneal refractive power can increase the average thickness of the peripapillary retinal nerve fiber layer (RNFL) and ganglion cell-inner plexiform layer by 2 to 3 μm acquired by optical coherence tomography. 4 It is unclear whether this effect is mediated by magnification or by anatomical physiological change. However, in our cohort, there were no patients with such an extreme change in corneal refractive power, with an average spherical equivalent of À4.50 ± 1.77 D (range À8.00 to À1.75).…”

mentioning

confidence: 99%

Reply: Transient effect of suction on retinal neuro-vasculature in myopic patients after small-incision lenticule extraction

Liu

Tonk

Huang

et al. 2021

J Cataract Refract Surg

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Transient effect of suction on the retinal neurovasculature in myopic patients after small-incision lenticule extraction

Liu

Tonk

Huang

et al. 2020

J Cataract Refract Surg

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Purpose: To characterize retinal neurovasculature changes after small-incision lenticule extraction (SMILE) in myopic patients. Setting: Ophthalmic Center, the Second Affiliated Hospital of Guangzhou Medical University, China. Design: Prospective interventional study. Methods: The corrected distance visual acuity/uncorrected distance visual acuity, corrected intraocular pressure (CIOP), and corneal tomography were evaluated at baseline (PRE), postoperative day (POD) 1, and POD 7. Ganglion cell-inner plexiform layer (GCIPL) and peripapillary retinal nerve fiber layer (pRNFL) thicknesses were measured. The vessel area densities (VADs, %), vessel skeleton densities (VSDs, %), vessel diameter index (VDI), and fractal dimensions (Dbox) of the superficial vascular plexus (SVP) and deep vascular plexus (DVP) were measured in a circular area (ϕ 2.5 mm) centered on the fovea. Results: A total of 38 myopic patients were recruited. The GCIPL thickness was increased after SMILE at POD 1 and POD 7 (P < .01) but no significant changes in the pRNFL thickness. The VAD, VSD, and Dbox of the SVP were decreased at POD 1 (P < .01), but not at POD 7. The VDI in small vessels of the SVP and DVP was decreased at POD 1 (P < .05) and increased at POD 7 (P < .05). Changes in CIOP were positively correlated with changes in the GCIPL thickness. Changes in CIOP were negatively correlated with changes in the VAD of small vessels and the Dbox of total vessels in the DVP. Changes in CIOP were negatively correlated with the VSD and VDI of small vessels in the DVP and changes in the VDI of big vessels in the SVP. Conclusions: The transient fluctuations in the retinal neurovasculature after SMILE may represent a characteristic homeostasis pattern in patients after refractive surgery.

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Effect of corneal refractive surgery on optical coherence tomography measurements

Cited by 7 publications

References 25 publications

Evaluation of Average Retinal Nerve Fiber Layer Measurement in Eyes with Refractive Errors

Evaluation of Average Retinal Nerve Fiber Layer Measurement in Eyes with Refractive Errors

Reply: Transient effect of suction on retinal neuro-vasculature in myopic patients after small-incision lenticule extraction

Transient effect of suction on the retinal neurovasculature in myopic patients after small-incision lenticule extraction

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