Ocular biometry in preterm infants: implications for estimation of retinal illuminance.

摘要: PURPOSE. Retinal illuminance varies with stimulus luminance, pupil size, eye and transmissivity of the ocular media. There are few published data to inform estimates retinal in early infancy, no concurrent studies size length have been described. The goals were document simultaneously measured parameters growing preterm infants estimate potential errors associated using either luminance or troland value as a proxy for this population. METHODS. Ocular biometry including diameters eye, vitreous chamber depth (VCD) dilated diameter was performed on 111 occasions 33 aged between 30 55 weeks’ postmenstrual age. RESULTS. Eye increased rapidly weeks comparable that term-born infants. ratio area VCD 2 highly variable. infant compared adult eyes underestimated by both values. CONCLUSIONS. Stimulus values cannot be used infer when comparing markedly differing sizes transmissivities. Error estimating prematurely born is inevitable because uncertainty regarding media transmissivity, but discrepancy can minimized directly presented herein (Invest Ophthalmol Vis Sci. 2008;49:453– 457)