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A huge factor when scuba diving is eyesight. Vision is a difficult subject to look into because there are so many different things that happen to the human eye when it is underwater. One of the effects on the eye from being underwater is refraction. Refraction can be observed when a straw is placed into a cup of water.

 

 

 

 

Refraction is "the turning or bending of any wave, such as a light or sound wave when it passes from one medium into another of different density." There is no actual change in the shape of an object when it enters water, it is just how our eye perceives that change. Refraction affects "bluriness," or focus distortion. Our experiment involves taking a picture of an eye chart ten feet away at different depths underwater. Through looking at these pictures we will be able to assess how much vision is affected the deeper you go. In other words whether refraction is more prominent at shallower or deeper depths.

 Image drawn by Alec.