照度レベルに依存するコントラスト感度の加齢変化

抄録

We measured contrast sensitivity function in the vision of young and aged observers under combinations of four different illuminance levels (1, 10, 100, and 1000 lx) and three different color temperatures (3000, 5000, and 6700K). We found that (i) no systematic difference appeared across color temperatures, (ii) the sensitivity was relatively worse in aged observers at higher spatial frequencies when the illuminance was high and at all spatial frequencies examined when the illuminance was low, and (iii) the deterioration cannot be explained only by the equality of retinal effective illuminance. These results suggest that the contrast sensitivity function can be used as the basis of lighting design for different visual tasks.