We evaluated 36 eyes in 23 infants between one and eleven months old who had primary posterior chamber intraocular lens implantation for congenital cataracts. All eyes had a capsulorhexis of anterior and posterior capsulae and anterior vitrectomy. In order to obtain an emmetropia at age 5 years, we chose a 35% undercorrection of lens power for infants less than six months old, and 25% for infants between seven and eleven months old. The average follow-up was 15.3 months. Nine eyes developed posterior synechiae and eight developed a posterior opacification. The average postoperative refraction was +5.81 dioptries at one month, +4.56 at four months, +1.5, at one year, and +0.19 at two years. There was a marked subjective visual improvement in 34 eyes.