Abstract
Infant marmosets were fitted with zero-powered (plano) soft contact lenses from 4 to 8 weeks of age worn either continuously (24 h per day) ( n=4), for 12 h ( n=4), or for 8 h ( n=3) per day to determine whether limiting the daily duration of lens-wear could significantly reduce or eliminate the effects of continuous lens-wear on ocular growth and refractive state. As in macaques (Hung, L. F., & Smith, E. L. (1996). Extended-wear, soft, contact lenses produce hyperopia in young monkeys. Optometry and Vision Science, 73, 579–584), eyes fitted with contact lenses worn continuously developed more hyperopic refractions (mean +3.22±1.49 D SE) compared to their fellow untreated eyes, inconsistent changes in vitreous chamber depth (−0.02±0.09 mm SE) and flatter corneas (mean decrease in corneal power 4.22±0.39 D SE). Eyes wearing lenses for only 12 h per day showed similar but reduced effects compared to the 24-h group. Most importantly, ocular growth, corneal power and refraction were unaffected in the 8-h group. Future studies using contact lenses in infant primates should employ a reduced daily duration of lens-wear to eliminate the undesirable effect of contact lens-wear per se on ocular development.
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