A progressive lens design is like a bi- or tri-focal lens in that it corrects more than one vision problem at a time. However, these lenses have no visible lines, improving the cosmetic appearance of ...

While not as popular as traditional glasses, contact lenses have distinct advantages for eye health and several innovations that benefit wearers. Consider the following to make an informed decision ...

The focal range of 26-45mm isn’t the broadest, but should suffice for many medium wide needs, and remember the 89-degree ...

Combining different glasses together resulted in a lens that corrected almost all aberrations. This type of lens is known as an Anastigmat, and the Protar was the first. There’s much more ...

\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.

What types of intraocular lenses (IOLs) are available? As you prepare for cataract surgery, you'll discuss IOL options with ...

Designed for all types of high-end photography needs as well as a host of professional video applications, the new Sony FE 50 ...

It’s making lenses using a standard CNC machine and a lot of elbow grease. The process of making a lens with a CNC machine begins by surfacing a waste board and taping an 8mm sheet of cast ...