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C. Stuetzle, E. Schmidt, A.G. Boehm, L.E. Pillunat; Evaluation of Optic Disc Measurement Using Indirect Ophthalmoscopy . Invest. Ophthalmol. Vis. Sci. 2005;46(13):2518.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To compare measurements of the optic disc size by indirect ophthalmoscopy to measurements by Heidelberg retina tomography (HRT). Methods: The optic disc size of 29 eyes was assessed using the 60 D, 78 D, 90 D and the Super field NC lens manufactured by Volk. Vertical and horizontal disc diameters were measured ophthalmoscopically using a Haag Streit slit–lamp. For the measurements the slit beam was projected on the surface of the optic disc. The slit beam was adjusted that the edge of the beam matched the optic disc border (scleral ring). The Optic disc area was calculated by applying the formula area= horizontal diameter x vertical diameter x π/4. Additionally the optic disc area was measured using HRT. The agreement of both methods was evaluated by using Bland–Altman plots. Results: The differences (amount) of the optic disc area over all measurements between ophthalmoscopy and HRT were: 0.346±0.245 mm ² (60D), 0.408±0,288 mm² (78 D), 0.303±0.175 mm² (90 D) und 0.297±0.261 mm² (Superfield NC Volk lens). Blund Altman plots showed that the mean of the differences between ophthalmoscopic measurements and HRT was close to zero for all lenses and an increase of scattering. An increasing disc size was observed. Conclusions: Optic disc area can be assessed by indirect ophthalmoscopy using common ophthalmoscopic lenses. In small optic discs the indirect ophthalmoscopy seems to be more reliable compared to measurements in large discs. Despite the differences compared to the HRT optic disc area measurements by indirect ophthalmoscopy seem to be a suitable clinical tool for the evaluation of optic disc size.
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