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Effect of intrastromal corneal ring segment depth on visual, refractive and topographic improvement

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Session Details

Session Title: Cornea
Session Date/Time: Friday 09/02/2018 | 08:30-10:00
Paper Time: 09:21
Venue: Annex A

First Author: R.Carneiro de Freitas PORTUGAL
Co Author(s): T. Monteiro  N. Franqueira  F. Faria Correia  F. Vaz        

Abstract Details


To analyze the effect of different ICRS depths on visual, refractive and topographic parameters


Hospital de Braga, Portugal


After manual implantation, ICRS depth was measured 6 months after the procedure using Swept-Source AS-OCT (Casia SS-1000, Tomey), and patients were divided into 2 groups: group 1 included patients in which the ICRS was located ≤30µm away from the intended depth, and group 2 included patients in which the ICRS was > 30 µm away from the intended depth of implantation. Visual, refractive and topographic parameters were measured and vectorial astigmatism analysis (Thibos method) was performed and compared between both groups at 6 months follow-up.


Group 1 included 36 patients and Group 2 included 63 patients. No statistical difference was found between both groups at baseline in any of the parameters evaluated. Both UDVA and CDVA improved in both groups (p<0.01), and no difference was found between both groups (UDVA p=0.79; CDVA p=0.86). No statistical difference was seen between the 2 groups regarding refractive sphere, refractive cylinder and topographic cylinder at 6M follow-up. In Group 1 no change was observed in J0, J45 and B, while a change in the vector magnitude could be seen in Group 2 at 6 months follow-up.


Different depths of ICRS implantation in relation to the primarily intended depth did not show a significant effect on visual, refractive and topographic parameters.

Financial Disclosure:


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