BIO Your cornea doesn't have blood vessels, so the living cells of the cornea must...

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BIO •• Your cornea doesn't have blood vessels, so the living cells of the cornea must get their oxygen from other sources. Cells in the front of the cornea obtain their oxygen from the air. Wearing a contact lens interferes with this oxygen uptake, so contact lenses are designed to permit the diffusion of oxygen. The diffusion coefficient of one brand of soft contact lenses was measured to be 1.3 × 10-13 m²/s. We can model the lens as a 14-mm- diameter disk with a thickness of 40 µm. The partial pressure of oxygen at the front of the lens is 20% of atmospheric pressure, and the partial pressure at the rear is 7.3 kPa. At 30.C how many oxygen molecules cross the lens in 1 h? BIO •• Your cornea doesn't have blood vessels, so the living cells of the cornea must get their oxygen from other sources. Cells in the front of the cornea obtain their oxygen from the air. Wearing a contact lens interferes with this oxygen uptake, so contact lenses are designed to permit the diffusion of oxygen. The diffusion coefficient of one brand of soft contact lenses was measured to be 1.3 × 10-13 m²/s. We can model the lens as a 14-mm- diameter disk with a thickness of 40 µm. The partial pressure of oxygen at the front of the lens is 20% of atmospheric pressure, and the partial pressure at the rear is 7.3 kPa. At 30.C how many oxygen molecules cross the lens in 1 h?