Publications by authors named "Gek L Ong"
Purpose: The aim of this study was to evaluate optical and visual functional performance of the osteo-odonto-keratoprosthesis (OOKP).
Methods: Optical design and analysis was performed with customized optical design software. Nine patients with implanted OOKP devices and 9 age-matched control patients were assessed.
Purpose: To explore the success of the application of a computerised videokeratography (CVK) software system for the fitting of rigid gas permeable (RGP) contact lenses (CLs) on irregular corneal surfaces and compare it to the standard diagnostic fitting procedure.
Methods: This was a comparative prospective study, over a 1-year period (2004-2005). It included 41 RGP CL wearers (68 eyes) with irregular corneal surfaces.
Purpose: To compare tritan contrast threshold (TCT) with fundus photography in screening for sight-threatening diabetic retinopathy (STDR), before significant visual loss.
Design: Prospective, comparative study.
Methods: A total of 510 consenting diabetic patients attending a hospital-based photographic screening clinic were recruited over a 2-year period.
Purpose: To investigate abnormalities of orientational contrast sensitivity (CS) and chromatic contrast threshold (CCT) in multiple sclerosis (MS).
Design: Case control study.
Methods: Nine subjects (mean age, 42 +/- 11 years; range, 20-62 years) with MS, an expanded disability status scale of 3 or less, and normal visual acuity (VA) (logarithm of the minimum angle of resolution [logMAR] VA less than.
Purpose: To study the effect of prematurity on monocular chromatic contrast thresholds (CCT) and achromatic contrast sensitivity (ACS).
Design: Case-control study.
Methods: A prospective study of 59 children born at less than 33 weeks' gestation was undertaken.