Lenses mounted in rimless style frames, including nylon cord and full metal or plastic that surround the frame, are prone to chipping. New styles are smaller, stiffer and designed with sharp corners. All of these issues cause more stress on the lens. Save yourself the hassle and embarrassment of a patient returning a frame with…

Although polycarbonate is a good choice for drilled lenses, trivex would be the BEST choice. Poly can crack under stress, tiny cracks form by drilling and using cleaning agents not recommended by Eye Care Professionals. None of these should occur if TRIVEX is used.

Finishing Lab Allentown Optical Building Surface Lab

Without posting a base curve chart, we will generalize the base curve selection. We begin with a plano lens. The base curve would most likely fall around 6 base. Going in the plus Rx direction- the base curve goes “higher”: 7 base, 8 base, 10 base. Going in the minus Rx direction – the base…

When a patient is interested in a wrap style frame, the Rx should be reviewed. An Rx that falls in the range of Sph.-3.00 to (+Sph. “anything almost”), is ideal. Care needs to be taken with a large cyl, which can drop the base curve lower. The lens material best suited for wraps is polycarbonate….