“…In kittens (Mitchell, Giffin, Wilkinson, Anderson & Smith, 1976), infant monkeys (Teller, Regal, Videen & Pulos, 1978;Teller & Boothe, 1979) and human babies (Teller, Morse, Borton & Regal, 1974;Atkinson, Braddick & Braddick, 1974;Dobson & Teller, 1978) there is a substantial and surprisingly slow improvement in visual acuity, measured behaviourally, during the first few months or more of life. New-born babies, both human and monkey, have grating resolution acuities of only about 0.5-1 cycles/deg (cycles per degree of visual angle), around 50-100 times lower than in adults (Teller et al 1974.…”