Table 1

Description of the population

All participants
(n=162)
Both eyes with log(CS) ≥1.5
(n=128, 79%)
Worst eye with log(CS) <1.5
(n=34, 21%)
P value*
Mean (SD)Median
(p5–p95)
Mean (SD)Median
(p5–p95)
Mean (SD)Median
(p5–p95)
Age76.1 (4.73)75.2 (70.8–84.9)75.9 (4.64)74.9 (70.8–84.9)77.0 (5.0)75.6 (70.6–88.7)0.195
Functional mobility
 TUG test (s)†9.49 (2.65)9.0 (6.8–15.1)9.16 (2.32)8.8 (6.3–13.1)10.7 (3.38)10.1 (6.1–16.3)0.002
Cognitive state
 MoCa (points)‡26.5 (2.63)27 (21–30)26.5 (2.53)27 (21–30)26.24 (2.99)27 (19–29)0.561
Driving
 Distance (km)/week238 (224)200 (60–500)234 (239)195 (60–500)253 (159)225 (40–550)0.668
 Restriction score2.3 (2.78)1 (0–8)1.88 (2.46)1 (0–6)3.68 (3.45)3 (0–12)<0.001
Vision
 VA bilateral§1.02 (0.20)1.0 (0.6–1.2)1.06 (0.17)1.2 (0.8–1.2)0.88 (0.24)1.0 (0.4–1.2)<0.001
 VA best eye§0.96 (0.22)1.0 (0.6–1.2)0.99 (0.21)1.0 (0.6–1.2)0.85 (2.05)0.8 (0.6–1.2)<0.001
 VA worst eye§0.72 (0.31)0.8 (0.2–1.2)0.79 (0.27)0.8 (0.4–1.2)0.46 (0.31)0.4 (0.0–1.0)<0.001
 Visual field¶183 (16)180 (160–200)185 (14)180 (160–200)179 (23)180 (140–200)0.059
 CS bilateral**1.72 (0.06)1.72 (1.6–1.76)1.73 (0.04)1.74 (1.68–1.76)1.66 (0.09)1.68 (1.48–1.76)<0.001
 CS best eye**1.69 (0.06)1.72 (1.56–1.76)1.73 (0.04)1.74 (1.68–1.76)1.66 (0.09)1.68 (1.48–1.76)<0.001
 CS worst eye**1.57 (0.25)1.64 (1.24–1.72)1.66 (0.06)1.68 (1.52–1.72)1.25 (0.38)1.44 (0.04–1.48)<0.001
  • *Student’s t-test comparing groups with or without contrast sensitivity loss.

  • †If ≥13.5 s: functional mobility difficulties. One person could not do the test and was not assessed.

  • ‡If <26 points: cognitive difficulties.

  • §In decimal.

  • ¶Visual field in degrees.

  • **Expressed in log(CS): considered as normal if ≥1.5 log(CS) and restricted if <1.5 log(CS).

  • CS, contrast sensitivity; MoCa, Montreal Cognitive Assessment; p5, fifth percentile; p95, 95th percentile; TUG, Timed Up-and-Go Test; VA, visual acuity.