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Corneal topographic aberrometric and biomechanical characteristics in tilted disc syndrome and their relationship with optic nerve head parameters and retinal nerve fiber layer thickness

Poster Details

First Author: P.Kösekahya TURKEY

Co Author(s):    O. Sarac   M. Caglayan   N. Cagil        

Abstract Details

Purpose:

To evaluate the topographic, aberrometric and biomechanical characteristics of cornea in tilted disc syndrome and to investigate the correlation between these parameters and optic nerve head parameters and retinal nerve fiber layer thickness in tilted disc syndrome.

Setting:

Eighty eyes of 46 patients with tilted disc syndrome (patient group) and 80 eyes with myopia and astigmatism of 46 healthy cases (control group) were included in this study.

Methods:

All cases attending to the study received ocular response analyzer, corneal topography, optic coherance tomography measurement after detailed ophthalmic examination. Corneal biomechanical (corneal hysteresis, corneal resistance factor), aberrometric (high order ocular aberrations), topographic (keratometry, pupil offset) characteristics, anterior segment parameters (central corneal thickness, anterior chamber depth, anterior chamber volume, anterior chamber angle) were compared between patient group and control group. Optic nerve head and retinal nerve fiber layer thickness measurements were compared between the groups and their relationship between corneal biomechanic, topographic and aberrometric characteristics were analyzed in the patient group.

Results:

There were no significant differences between two groups in terms of spherical equivalent and total astigmatism (p=0.92, p=0.09 respectively). Astigmatism was mainly corneal in patient group. Corneal biomechanical and aberrometric characteristics, anterior segment parameters were similar between the two groups (p > 0.05 for all values). The pupil offset was shifted to inferonasal and visual axis was shifted to superotemporal direction in patient group and it was correlated with ocular aberrations, keratometric values and anterior chamber parameters. Corneal topographic, aberrometric and biomechanical characteristics were not correlated with optic nerve head parameters and retinal nerve fiber layer thickness in patient group.

Conclusions:

Tilted disc syndrome is not only a posterior segment disease but it also causes changes in anterior segment morphology. Especially the changes in visual axis in these patients must be kept in mind while planning refractive surgery in order to avoid undesirable results.

Financial Disclosure:

NONE

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