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Shpak A.A.

S.N. Fyodorov National Medical Research Center «MNTK «Eye Microsurgery»

Morina N.A.

S.N. Fedorov National Medical Research Center «MNTK «Eye Microsurgery»

Pismenskaya V.A.

S.N. Fedorov National Medical Research Center “MNTK “Eye Microsurgery”

Area of the foveal avascular zone in patients with refractive errors

Authors:

Shpak A.A., Morina N.A., Pismenskaya V.A.

More about the authors

Journal: Russian Annals of Ophthalmology. 2022;138(6): 26‑31

DOI: 10.17116/oftalma202213806126

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Table of contents

AREA OF THE FOVEAL AVASCULAR ZONE IN PATIENTS WITH REFRACTIVE ERRORS
AREA OF THE FOVEAL AVASCULAR ZONE IN PATIENTS WITH REFRACTIVE ERRORS

To cite this article:

Shpak AA, Morina NA, Pismenskaya VA. Area of the foveal avascular zone in patients with refractive errors. Russian Annals of Ophthalmology. 2022;138(6):26‑31. (In Russ.)
https://doi.org/10.17116/oftalma202213806126

Подписка 2026 Вестник офтальмологии (Russian Annals of Ophthalmology)
 
МСФ на ЯМ
Использование инфографики авторами научных работ
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Abstract:

PURPOSE

To investigate the dependence of the area of the foveal avascular zone (FAZ) on axial eye length (AL) and to develop a feasible method for correcting this dependence.

MATERIAL AND METHODS

The study involved 209 patients over the age of 18 years (209 eyes), of them 52 patients with AL of 20—22 mm (hyperopia group), 60 patients with AL of 25.5—28.5 mm (myopia group) and 97 patients with AL of 22.5—24.5 mm (emmetropia group). Optical coherence tomography angiography (OCTA) examination was performed on Cirrus HD-OCT 5000 with AngioPlex («Carl Zeiss Meditec», Germany).

RESULTS

FAZ area was corrected using the Littmann-Bennett formula modified by A.A. Shpak and M.V. Korobkova. FAZ area values both in emmetropic patients and in patients with refractive errors varied over a very wide range. Before correction, AL had a significant influence on the FAZ area (mm2), which compared to the emmetropia group (0.27±0.09) was significantly reduced in the myopia group (0.21±0.07; p<0.000) and increased in the hyperopia group (0.31±0.11; p=0.015). The corrected FAZ area values did not differ in the compared groups. After correction the FAZ area decreased on average by 19% in the hyperopia group and increased by 25% in the myopia group. A chart and an Excel (Microsoft)/LibreOffice Calc program have been developed for correction of the FAZ area depending on the AL.

CONCLUSION

Refractive errors, especially high-degree ones, have a significant effect on the FAZ area. This study proposes an original chart and a calculation program for correct interpretation of FAZ area measurements in patients with refractive errors, providing an accessible and quick way to assess the obtained results.

Keywords:

optical coherence tomography angiography
foveal avascular zone
area
hyperopia
myopia
correction formula

Authors:

Shpak A.A.

S.N. Fyodorov National Medical Research Center «MNTK «Eye Microsurgery»

Morina N.A.

S.N. Fedorov National Medical Research Center «MNTK «Eye Microsurgery»

Pismenskaya V.A.

S.N. Fedorov National Medical Research Center “MNTK “Eye Microsurgery”

Received:

04.11.2021

Accepted:

21.02.2022

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References:

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