Posters

SAANA classification for intracorneal ring segment implantation in keratoconus patients

Poster Details

First Author: E.Branchevskaya RUSSIA

Co Author(s):    M. Sheutzhen   S. Branchevsky                 

Abstract Details

Purpose:

To evaluate refractive and topographic changes after intracorneal ring segments (ICRS) implantation according to SAANA classification in keratoconus patients.

Setting:

Branchevsky Eye clinic, Samara Moscow eye clinic, Moscow

Methods:

42 eyes of 28 keratoconus patients  (17 male, 11 female) had manual (30 eyes) or femtosecond laser (FS 200, Alcon, USA) assisted (12 eyes) ICRS (The S. Fyodorov Eye Microsurgery Federal State Institution Research Enterprise) implantation. Corneal segments with an internal diameter 5.0 mm of different thickness and arc length were used. Pre-and postoperative assessments included uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), Scheimpflug-tomography (Oculyzer, Alcon, USA), were performed at 1 week and 1, 3, 6 and 12 months post. op.

Results:

Six months after ICRS implantation mean decimal UDVA improved from 0.24±0.24 (range 0.02–0.7) to 0.46±0.28 (range 0.02–1.0) and CDVA improved from 0.58±0.27 (range 0.09–1.25) to 0.74±0.25 (range 0.2 to 1.0). Mean sphere decreased from  -2.92 ±3,64 (-10.75-2.75) to -1.77±2.13 (range-7.5-+1.5). Topographic cylinder decreased from 3.89±2.67 (0-8.5) to 2.12±2.05 (0-5.5). 2 eyes (4,7%) lost 2 lines of CDVA. Topographical changes were assessed according to 4 criteria of segments implantation (symmetric axial, asymmetric axial, symmetric non-axial, asymmetric non-axial) of R.I. Barraquer SA.ANA classification.

Conclusions:

ICRS implantation can increase visual acuity and decrease ametropia in keratoconus patients. The procedure is considered to be safe but there might be some cases of CDVA loss. Asymmetric axial and asymmetric non-axial types of ICRS implantation tend to show better topographical results.

Financial Disclosure:

None