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Br J Ophthalmol 87:747-752 doi:10.1136/bjo.87.6.747
  • Original Article
    • Clinical science

Assessment of colour vision as a screening test for sight threatening diabetic retinopathy before loss of vision

Table 4

Comparison of TCT and ophthalmic diagnoses for all patients with pass/fail criterion of z = −1.75

Ophthalmological assessment
No retinopathy Background retinopathy Preproliferative retinopathy Proliferative retinopathy Maculopathy Total
TCT (z ≤ −1.75)
    Normal 365 102 1 0 0 468 (92%)
    Abnormal 18 8 2 2 12 42 (8%)
% of correct TCT diagnosis 95.3% 92.7% 66.7% 100% 100%

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