Table 2. Functional testing.
| Ocular test | T1DM | Controls | P-value | % of T1DM falling below normal reference range |
|---|---|---|---|---|
| FDP, MD | −1.34 (2.84 dB) | 0.57 (2.49 dB) | P=0.033 | 18.5 |
| FDP, PSD | 2.96 (0.95 dB) | 2.84 (1.67 dB) | P=0.016 | 0 |
| FDP, foveal threshold | 29.24 (4.93 dB) | 30.77 (3.62 dB) | P=0.420 | 10.7 |
| Log contrast sensitivity | 1.63 (0.06) | 1.77 (0.13) | P<0.001 | 14.2 |
| Dark adaptation, rod intercept | 9.7 (1.0 min) | 9.0 (1.5 min) | P=0.145 | 3.7 |
Abbreviations: FDP, frequency doubling perimetry; MD, mean deviation; PSD, pattern standard deviation; T1DM, type 1 diabetes mellitus.
Results of functional tests are displayed. Participants with diabetes tended to perform more poorly on tests of inner retinal function compared with controls. Comparisons were made with the Mann–Whitney U-test, and results are presented as mean (SD). The normal reference range was defined by the mean of the control group±2 SDs.