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Br J Ophthalmol 84:877-880 doi:10.1136/bjo.84.8.877
  • Original Article
    • Clinical science

Screening for CMV retinitis using chromatic discrimination thresholds and achromatic contrast sensitivity

Table 1

Demographic data, achromatic contrast sensitivity (ACS), and colour discrimination thresholds for patients with CMVR, HIV, and normal controls

Patient groups
CMVR HIV+ Controls
Demographics:
 Number 11 16 29
 Age 42.7  (5.5) 41.1  (4.5) 42.9  (8.3)
 VA/logMAR 0.09 (0.22) 0.01 (0.07) −0.02 (0.1)
Achromatic:
 0.33 cpd 1.43 (0.23) 1.58 (0.21) 1.53 (0.13)
 0.66 cpd 1.75 (0.28) 1.91 (0.20) 1.87 (0.10)
 2.2 cpd 2.12 (0.53)* 2.43 (0.11) 2.41 (0.19)
 3.3 cpd 1.99 (0.58) 2.43 (0.15) 2.38 (0.15)
 10 cpd 1.43 (0.62)** 1.91 (0.28) 1.82 (0.24)
 17 cpd 1.06 (0.53) 1.37 (0.37) 1.30 (0.28)
Chromatic:
 RGDT 0.73 (0.49)** 0.42 (0.19) 0.42 (0.16)
 TDT 0.90 (0.45) 0.42 (0.16) 0.40 (0.15)
  • ACS was reduced significantly in patient with CMVR, at 2.2 (*p<0.05), 3.3 (p<0.005), and 10 cpd (**p<0.01) compared with controls and patients with HIV infection. Chromatic discrimination threshold was reduced on the red-green (**p<0.01) and the tritan axes (p<0.0001).

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