The Amos Tuck School of Business Administration is the graduate business school of Dartmouth College, an Ivy League research university in Hanover, New ...
Our experienced team of youthful and passionate dive professionals are ecstatic to be able to share with you the underwater world. Sunreef is one of the biggest employers of full time dive professionals in Australia and the team is privileged to show you why.
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Underwater vision is affected by the clarity and the refractive index of the medium. Visibility underwater is reduced because light passing through water attenuates rapidly with distance, leading to lower levels of natural illumination. Underwater objects are also blurred by scattering of light between the object and the viewer, resulting in lower contrast. These effects vary with the wavelength of the light, and the colour and turbidity of the water. The human eye is optimised for air vision, and when it is immersed in direct contact with water, visual acuity is adversely affected by the difference in refractive index between water and air. Provision of an airspace between the cornea and the water can compensate, but causes scale and distance distortion. Artificial illumination can improve visibility at short range.  Stereoscopic acuity, the ability to judge relative distances of different objects, is considerably reduced underwater, and this is affected by the field of vision. A narrow field of vision caused by a small viewport in a helmet results in greatly reduced stereoacuity,  and an apparent movement of a stationary object when the head is moved.  These effects lead to poorer hand-eye coordination.