TIGHTLINES UV Beaver, TightLines UV has created the next generation of fishing tackle with the invention of Ultimate Vision through TIGHTLINES new Nano-Infused Polymerization (NIP) Technology. Bass dont have the UV filters like that of the human eye. Thats why they prefer darkness to bright sunlight. Therefore, the only way that Bass can protect their eyes from UV degradation is by retreating to shady areas such as stumps, submerged logs, vegetation, floating lily-pads, etc. Ultimate Vision is an ultraviolet (UV) vision enhancer that is focused on the wavelength of light that Bass use the most to search out their prey, but is transparent to fishermens eyes.