Suprasil300

The user of this tool, however, will encounter terms like “macular pigment optical density,” “vertical photopic illuminance” and “spectral power distribution,” indicators that it’s probably best left to professional lighting designers.

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SuprasilQuartz

We include both optical density and direct cell counts to unambiguously demonstrate growth using two independent methods.

One other such phenomenon is that of so-called apparent optical depth, which an observer encounters when looking through transparent media of varying optical density.

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SuprasilSyrup

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This defect in the eye-lens is somewhat counteracted by a variable optical density, increasing from the outer to the central portion.

Accordingly, when the optical density of the air changes as a result of its varying content of moisture, the colour-phenomenon undergoes an opposite change in each of the two cases.