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One obvious area of usefulness of an OCT system is in disc analysis. Patient PB, a 60-year-old male had attended the clinic for a routine eye examination. The right disc had a vertical C/D ratio of 0.6 with some apparent superior neuroretinal rim (nrr) thinning, the left disc C/D of 0.6, more concentric nrr, but some evidence of temporal peripapillary atrophy.
Full threshold fields proved unreliable, even after repeating, primarily due to poor fixation. This had been a problem on previous assessments according to the records. OCT analysis of the retinal nerve fibre layer for each eye (Figure 1 right eye, Figure 2 left eye) showed nerve fibre layer thicknesses within normal levels compared with the normative database (as indicated by the micron values and green colour coding of the 'wheel'). Parameters may be accurately monitored to note for any changes in time. This illustrates how OCT may be of use when fields are less than helpful. The very subjective nature of fields assessment often throws up such cases.
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