Posters

Our experience of multifocal lens implantation in myopic eye with unusual geometry

Poster Details

First Author: B. Babayeva AZERBAIJAN

Co Author(s): L. Bilandarli   S. Mammadov                 

Abstract Details

Purpose:

Extension of active period of human life in modern society confronts doctors with new challenges. The target is not only the solution of health problems, but also improving the quality of life. So if 10 years ago emmetropia after cataract surgery was considered as the 'gold standard', now - this is an excellent vision of the near and middle distance in the absence of spectacle correction. The emergence of trifocal IOLs allowed ophthalmologists to extend the 'glasses-free' period of patients. However, there was a lot of other difficulties related to the correctness of the calculation MIOL, implantation techniques and others.

Setting:

Azerbaijan National Center of Ophthalmology named under academician Zarifa Aliyeva.

Methods:

A., diagnosed «OU - initial cataract, compound myopic astigmatism'. Visus w/c = 20/200. Refraction: sph -12,0 D, cyl -0,75D ax 40 °. IOL Master: K1 = 47,01D; K2 = 47,94D; AL = 26,09mm; ACD = 3,80mm; WTW = 11,5 mm. MIOL power by IOL Master using Holladay - 7,0D (Ref. -0,05D), 7,5D (-0,3D), 8,0D (-0,65D), 8,5D (-0,95D). Using SRK / T - 8,0D (0,08D), 8,5D (-0,19D), 9,0D (-0,47D), 9,5D (-0,75D). Surgeon implanted trifocal Acriva Reviol BBMFM611(VSY Biotechnology) 10,0D. Next morning the visual acuity - 20/25, refraction sph -0,25 D, cyl -1,25D ax 48 °. Near and middle vision - unsatisfactory.

Results:

To determine influence of eye’s unusual geometry to MIOL power, we decided to consider options by it’s theoretically calculating, in which a change of one of biometric parameters makes their relationship ordinary, as well as to analyze the dynamics of the error’s changing. The biggest difference in MIOL optic power's errors seen in eyes with unusual geometry in range [0,52-0,7D]. By changing keratometry to averaged and maintaining other original data, errors difference was nearly constant in range [0,23-0,25D]. By changing axial length to averaged and maintaining other parameters, error difference was two times higher in range [0,53-0,63D].

Conclusions:

In assume, for eyes with high axial length and averaged keratometry, sensitivity of Holladay and SRK / T formulas is approximately equal. For eyes with averaged axial length and high keratometry, difference between the two formulas is about 0.5D. For eyes with unusual geometry it can reach 0,81D. Conclusions: 1. Calculating of MIOL power for eye with unusual geometry should be carried out for plano target refraction. 2. The necessity of the studies of intraocular structure’s morphometric relationships in the eyes with unusual geometry. 3. MIOL’s implantation in eyes with unusual geometry can be following by unexpected refractive surprises.

Financial Disclosure:

None