Copenhagen 2016 Registration Programme Exhibitor Information Virtual Exhibition Satellite Meetings Glaucoma Day 2016 Hotel Star Alliance

10 - 14 Sept. 2016, Bella Center, Copenhagen, Denmark

This Meeting has been awarded 27 CME credits


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Keraring intrastromal position assessed by spectral-domain optical coherence tomography

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Session Details

Session Title: Presented Poster Session: Anterior Segment Imaging

Session Date/Time: Monday 12/09/2016 | 09:30-11:00

Paper Time: 10:30

Venue: Poster Village: Pod 4

First Author: : Sanctis ITALY

Co Author(s): :    C. Lavia   M. Nassisi   R. Penna   F. Grignolo     

Abstract Details


Comparison of two methods to measure the Keraring (Mediphacos, Belo Horizonte, Brasil) distance from corneal surfaces using spectral-domain optical coherence tomography.


Eye Clinic, University of Turin, Italy.


A cross-section image of Keraring was acquired with RTVue 100 (Optovue, USA) in 18 consecutive eyes operated for keratoconus. The distance of the Keraring apex from the anterior corneal surface and the distance of the inner and outer corner from the posterior corneal surface were measured by tracing parallel vertical sections and minimal distances. The methods were compared using a paired T test. The 95% limits of agreement (95% LoA) and absolute difference were calculated to assess differences between measured and intended distance.


As compared with the minimal distance method, the parallel vertical section method overestimated (<0.001) all distances. The minimal distance of the inner corner from the posterior corneal surface was very close to the intended distance (143.25 ±30.00 versus 144.60 ±28.71 µm; P=0.86) and had the narrowest 95% LoA (-68.88 to 66.18 µm) and the lowest absolute difference (27.35 ±20.04 µm) with the intended distance. On average, the distance of the apex from the anterior surface was <92 µm than intended and the distance of the outer corner from the posterior surface was >107 µm than intended by both methods.


The distances measured with the two methods are statistically different. The minimal distance of the inner corner from the posterior surface showed the smallest differences with the intended distance and might be used to predict Keraring depth.

Financial Disclosure:


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