Pre-Study: Evaluation of the inter- and intrarater reliability of the integrated algorithm by Heidelberg Spectralis for measuring cyclotorsion on SLO-fundus fotographs, and assessment of the influence of measuring with or without eye tracker. Study: Comparison of cyclotorsion measurements in patients with forth nerve palsy and in healthy controls on SLO-fundus fotographs using the integrated algorithm by Heidelberg Spectralis
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
DIAGNOSTIC
Masking
NONE
Enrollment
82
University Hospital Zurich, Dept of Ophthalmology
Zurich, Canton of Zurich, Switzerland
pre-study: reliability of repeated measurements of excyclotorsion in degrees on SLO-fundus fotographs
pre-study: inter- and intrarater reliability of the device with or without eye tracker; excyclotorsion in degrees (based on the line crossing the fovea and the center of the optic nerve head) as provided by the integrated algorithm by Heidelberg Spectralis
Time frame: 3 months
study: excyclotorsion in degrees on SLO-fundus fotographs
study: comparison of cyclotorsion measurements in healthy controls compared to patients with forth nerve palsy; excyclotorsion in degrees (based on the line crossing the fovea and the center of the optic nerve head) as provided by the integrated algorithm by Heidelberg Spectralis
Time frame: 12 months
study: excyclotorsion in degrees on tangent screen, double maddox and fundus photographs
validation of the cyclotorsion measurement with the Heidelberg Spectralis device against tangent screen \[degrees\], double maddox \[degrees\] and fundus photographs \[degrees\]
Time frame: 12 months
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