So many people, including some optical lenses seller, do not know much about optics, optical engineering, and optical systems. They do not have any idea of how to design a lens, and may only flow with the terms put in place. As a result, most of these people never bother to learn more about the best optical component manufacturers or any other knowledge related to the optics.
Optics is pure physics that deals with the behavior of light where experts tend to be concerned with lens design or optical design. It is concerned with the magnification, visibility, and wavelengths among other aspects which involves correction of aspects in the visible spectrum among other aspects. A lens designer tends to focus on having a glass capable of collecting and distributing of light in a specifically desired way. As a result, there are lenses which correct sight, interchangeable lenses used in camera among other aspects. Watch this video https://www.youtube.com/watch?v=ORUGwPP-mb4 about optics.
The modern lens designers tend to work on various types of lenses and include binocular lenses from www.jmloptical.com, telescopes, microscopes, camera lenses which deal with video, zoom, movies, and photos, slide, overhead, video projector, office copier, laser printers, fax machines, and microfilm readers. Endoscopes used in the minimally invasive surgery tend to use lenses as well. The ultra-precise projector lenses, product code laser scanners, laser-based optical readers among other technologies that use optical lenses.
One would also need to note that every type of lens tends to come with its own use and hence demand a special design. The design starts with the problem definition, the pre-design phase, and the starting point selection. The design process then goes on to the initial analysis which focuses on the improvement versus spec. the lens design then goes on to the optimization phase which tends to happen after one has set all the parameters which include the index of refraction, thickness, curvature among other parameters.
The optimization also tends to include the error function and the constraint before the actual optimization. During the optimization phase, the variables tend to be altered with the intention of correcting any error which at times calls for many changes while in others only minor errors are noticed. The final analysis phase then tends to take place which is then followed by the preparation of fabrication. While the optical design tends to involve so much engineering, some of the best designers have invested highly in what they do and hence tends to make sure that they offer the best to their customers.