E.G. POGODINA¹, I.A. MUSHKOVA², A.N. KARIMOVA², V.G. MOVSHEV³

¹Orenburg branch of S. Fyodorov Eye Microsurgery Federal State Institution, 17 Salmyshskaya Str., Orenburg, Russian Federation, 460047

²S. Fyodorov Eye Microsurgery Federal State Institution, 59 A Beskudnikovsky Blvd, Moscow, Russian Federation, 127486

³Optosystems Ltd, 1A Promyshlennaya Str., Troitsk, Russian Federation, 142191

 Pogodina E.G. ― ophthalmologist of Laser Surgery Department, e-mail: elenapogodina56@yandex.ru

Mushkova I.A. ― D. Sc. (medicine), Head of Laser Refractive Surgery Department, Scientific Secretary of the Dissertation Council, ophthalmologist, e-mail: i.a.mushkova@yandex.ru

Karimova A.N. ― PhD (medicine), Researcher at the Department of Laser Refractive Surgery, e-mail: adelya.k.n@mail.ru

Movshev V.G. ― Cand. Phys. and Math. Sc., Head of the Department of Medical Lasers at Thematic Design Department №7, e-mail: vmovshev@yahoo.com

The article represents the estimation of results of visual acuity, functional optical zone, changes in pre- and postoperative conic constant, high order (spherical) aberrations or multifocality in patients with myopia when excimer laser operations with aspherical and standard algorithm were performed using «Microscan-CFP». The analysis of postoperative corneal surface for getting effective aspherical surface showed that the value of the conic constant -0.2 was insufficient for correction of myopia exceeding 4.0 D. To optimize the aspherical algorithm with the aim of improving functional optical zone, when correcting myopia with a spherical equivalent of more than -4.0 D, a nomogram was proposed.

Key words: aspherical ablation, conic constant, nomogram, functional optical zone.

(For citation: Pogodina E.G., Mushkova I.A., Karimova A.N., Movshev V.G. Nomogram for aspherical operations for myopia correction using «Microscan-VIZUM» excimer laser. Practical Medicine. 2018)

REFERENCES

1. Atezhev V.V., Barchunov B.V., Vartapetov S.K. et al. Laser technologies in ophthalmic surgery. Laser Physics, 2016, vol. 26, no. 8, pp. 1-20.
2. Balashevich L.I. Refraktsionnaya khirurgiya [Refractive surgery]. Saint Petersburg, 2009. 285 p.
3. Koller T., Iseli H.P., Hafezi F. et al. Q-factor customized ablation profile for the correction of myopic astigmatism. J. Cataract. Refract. Surg, 2006, vol. 32, no. 4, pp. 584-589.
4. Camellin M., Arba Mosquera S. Aspheric Optical Zones: The Effective Optical Zone with the SCHWIND AMARIS. J. Refract. Surg, 2011, vol. 27, no. 2, pp. 135-146.
5. Drum B. The Evolutionof the Optical Zone in Corneal Refractive Surgery. 8th International Wavefront Congress, 2007.
6. Rojas M.C., Manche E.E. Comparison of videokeratographic functional optical zones in conductive keratoplasty and LASIK for hyperopia. J. Refract. Surg, 2003, vol. 19, pp. 333-337.
7. Blinkova E.S., Fokin V.P., Solodkova E.G. Sposob rascheta diametra opticheskoy zony rogovitsy i ego vliyanie na uroven’ aberratsiy posle LAZIK [Method of calculating the diameter of the optical zone of the cornea and its effect on the level of aberrations after LASIK]. “Sovremennye tekhnologii kataraktal’noy i refraktsionnoy khirurgii-2012”: materialy konferentsii. P. 207.