Abstract
Measurements of optic disc diameter with the Zeiss 4-mirror contact lens and 78 dioptre (D) lens, made by projecting a slit-beam of known height onto the image of the disc, were compared with planimetric measurements in 30 eyes. The 78 D lens measurements were significantly larger than both the Zeiss lens and planimetric measurements (p<0.0001 and p = 0.0047 respectively). The measurements using the Zeiss lens and planimetry did not differ significantly. Compared with planimetry, for the 24 eyes within 3 D of emmetropia, the correlation was greater for the Zeiss (r= 0.8591) than for the 78 D lens (r=0.7148). The Zeiss lens also showed better agreement and less scatter of results compared with the 78 D lens (standard error of the mean ± 0.0373 mm for the Zeiss and ± 0.0418 mm for the 78 D lens). The Zeiss contact lens measurements of optic disc diameter show stronger correlation and better agreement with planimetry than measurements using a 78 D lens.
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Spencer, A., Vernon, S. Optic disc height measurement with the Zeiss 4-mirror contact lens and 78 dioptre lens compared. Eye 10, 371–376 (1996). https://doi.org/10.1038/eye.1996.76
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DOI: https://doi.org/10.1038/eye.1996.76