Transmission of the Ocular Media

The spectral transmittance of ultraviolet, visible, and near infrared light through the ocular media of humans has been measured. Using freshly enucleated eyes, the transmittances of each component part (cornea, aqueous humor, lens, vitreous humor) were determined for the wavelength range from 0.22 to 2.8 fi. To date, 9 eyes have been measured, from persons ranging in age from 4 weeks to 75 years. Two types of measurements were made, the first to measure the total light transmitted (direct and scattered) at each wavelength, and the second to measure the per cent transmittance of that light passing directly through the various media tuithout absorption or scattering. The results show that: (a) The transmission of ultraviolet radiation decreases with the age of the eye. (b) The transmission of infrared radiation appears to be independent of the age. (c) The maximum total transmittance of the whole eye, which is about 84 per cent, is obtained in the region from 650 to 850 mfi.