03.Water Opitics
03 Water optical
Place other brand names spherical lens. Now we will find that the cross mark on the lens has become unclear. We need to adjust the optometry unit. Until the cross mark becomes clear. Now we will find the the lens under the water will 242 power nearsighted.
Below when place other brand names arc lenses. What are the changes under the water? We find that the cross mark on the lens has disappeared. Instead, an unclear yellow. We need to adjust the optometry unit.
Then we found that this lens has severe astigmatic.
After adjusted the clarity. We found that this lens have 546 power of astigmatic.
The experiments show that only the absolute flat swimming goggles lens is able to maintain the same non-change standard beneath and above the water.
Other spherical and arc lenses under water will at least produce 250 power nearsighted or 500 power+ astigmatic vision difference.
Swim is the kind of sports that floats in the air and sink in the water at the same time. The vision we view on air and in water is constantly changing. Must be able to wear a pair of swimming goggles which is suitable for both on air and in water. The vary between the two medias. A pair that will not change the vision nor hurt the eyes.