I believe the correct answer is: material that the lens is
made from.
Lenses are engineered to have
specific focal lengths, besides the curvature of the two sides of a lens. The
focal range, the distance between your optic nerve and the retins in lens, of
the lenses is determined by the material that lenses are made from.
Linda Apple is an amazing oil painter. She has made a few books with her work in them. When she has extra time she likes to work with other art mediums as well.
Yes but it all depends on how big it is and the area it covers a lot of tattoo artist will tell you to keep it clean and easy for a week or two allowing it time to heal
