Relationships between central corneal thickness and optic disc topography in eyes with glaucoma, suspicion of glaucoma, or ocular hypertension.

Purpose: To identify relationships between central corneal thickness (CCT) and optic disc topography, as determined by scanning laser ophthalmoscopy (SLO), for patients seen in a specialist glaucoma service.

Methods: 272 eyes of 144 patients with primary open angle glaucoma (POAG; n = 71), normal tension glaucoma (NTG; n = 50), ocular hypertension (OH; n = 48) and those considered to be suspicious for glaucoma (GS; n = 103) underwent ultrasonic pachymetry and optic disc topography by SLO. Correlations between CCT and SLO parameter values were identified.

Intraobserver and interobserver reliability indices for drawing scanning laser ophthalmoscope optic disc contour lines with and without the aid of optic disc photographs.

Purpose: To investigate the effects on topographic optic disc analysis of defining regions of interest (ROIs) by drawing contour lines with and without photographic aid.

Patients And Methods: Forty-five patients had optic disc imaging by stereoscopic photography and confocal scanning laser ophthalmoscopy using the Heidelberg Retinal Tomograph (HRT). Two experienced observers defined ROIs with a stereoscopic optic disc photograph, with a non-stereoscopic photograph and without any photographic guide.

Evaluation of tonometric correction factors.

Purpose: To investigate the efficacy of currently available correction factors in correcting intraocular pressure (IOP) measurements for the errors induced by the normal variations in corneal structural characteristics.

Materials And Methods: Central corneal thickness (CCT) and corneal radius of curvature were measured on 324 individuals (175 normal: group 1 and 149 had either open angle glaucoma or ocular hypertension: group 2). IOP was measured in all normal subjects with the Goldmann applanation tonometer and the highest recorded IOP was obtained from patient charts for subjects with either open angle glaucoma or ocular hypertension.

Repeatability and effects of sequential measurements with POBF tonograph.

Aims: (1) To investigate the effect of performing sequential measurements using a Pulsatile Ocular Blood Flow (POBF) Tonograph on POBF and intraocular pressure (IOP) measurements; (2) to determine any effect on IOP caused by performing POBF measurements on the fellow eye; and (3) to assess repeatability of measurements obtained using the POBF Tonograph.

Methods: Forty-six normal adult subjects (13 men, 33 women; age range, 18 to 55 years) took part in the present study. Twenty-one subjects underwent sequential measurements with a POBF Tonograph on five different occasions with five different time intervals (1, 2, 5, 10, and 15 minutes) between recordings.