When a presbyope from emmetrope reading, the image of the letters will focus behind retina. Suppose you were walking to a movie theater on a sunny day, and while outside you could wear red sunglasses or green sunglasses. Visual sensitivity of cones and rods varies with wavelength of light. Compare to green light wavelength, red light is a less effective stimulus for rods. Therefore, rods respond to red light in a similar way as in the dark.
Rod vision is more sensitive than cone vision.
Rod vision has lower acuity than cone vision. Only one kind of rod compare to three cones preferring different wavelength. Rods are larger in size than cones. Rod is mainly in the periphery and absent from the fovea. High spatial frequencies.