The dual elements (commonly known as doublets) used in its design, are sealed inside an air space. This optical formula helps eliminate aberration and distortion, maintaining optical performance to the highest standard. A very flat plane of focus, virtually free of color fringing and improved sharpness is provided while maintaining the magnification of the original diopter lens when submerged.
The Aquatica close lenses have true magnification value, when a close up lens is not air sealed, refraction will rob it of most of its magnification the moment it is immersed in liquid. The Aquatica Close-Up lenses retain their strength at all-time also guarantying improved performance over single element design.