PT - JOURNAL ARTICLE AU - J C H Tan AU - D F Garway-Heath AU - R A Hitchings TI - Variability across the optic nerve head in scanning laser tomography AID - 10.1136/bjo.87.5.557 DP - 2003 May 01 TA - British Journal of Ophthalmology PG - 557--559 VI - 87 IP - 5 4099 - http://bjo.bmj.com/content/87/5/557.short 4100 - http://bjo.bmj.com/content/87/5/557.full SO - Br J Ophthalmol2003 May 01; 87 AB - Aim: To characterise measurement variability in scanning laser tomography of the optic nerve head. Methods: 21 normal and 21 glaucoma subjects underwent same and separate day test-retest Heidelberg retina tomograph imaging by the same and different operators. Results: Rim area was most reproducible among parameters. Its variability tended to be highest temporally and increased (p<0.05) with testing involving different operators and visits. Nature of regional variability differed between glaucoma and normal eyes and between standard and 320 μm reference planes. Conclusions: Rim area is reproducible and potentially useful as a marker of progression. Pattern of variability and the influence of different reference planes, disease, operators, and visits should be considered when evaluating progression.