Through reciprocal transplants, Yamamoto and Jeffery found that the lens vesicle of surface fish can induce other parts of the eye to develop in cave- and surface-dwelling fish, while the lens vesicle of the cave-dwelling fish cannot.
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Optometrists encourage patients to consult an eye-care professional to make sure that they have the right contact lenses for their particular eyes and then to follow the recommended wear schedule and lens-care instructions.
Finally, birds of prey, like other birds, have eyes equipped with a powerful lens that can change its focus quickly from objects an inch away [a few centimeters away] to those at a great distance.
As a young Jonadab, I said to myself, ‘Len, if you want to be viewed by Christ as a sheep, you’ve got to support his anointed brothers, accepting their leadership because God is with them.’
Most laboratories insist that everyone wears protective goggles. Without them, it is too risky to work with most chemicals. Usually, the lens is a special type of plastic which protects you from both mechanical impacts and acid and base chemicals