Traditional vs Freeform Surfacing Traditional lens making tools can work only on the backside of the lens. They cannot create aspheric shapes or the complex curves required for PALs (progressive addition lens). This is why the progressive channel of designs has traditionally been pre-molded by the manufacture on the front surface of the lens. Freeform…
The following are facts about SHAMIR Shamir was established in 1970 as an engineering firm and is now the largest lens designer in the world. In 2004 Shamir had cooperatively designed 7 of the 12 top selling progressive lenes Shamir designed the first free form lens the Definity six years ago. Shamir has trademark rights…
Things to consider: New or old lens and lens material. CR-39 is the most versatile material to tint. Not much to worry about. Check old lens for defects and any coatings (ex. AR) applied. AR may need to be stripped first, this could damage the lens. Polycarbonate can be tinted if a tintable scratch resistant…
Today our lives are strongly influenced by the automobile. Traditional eye wear and sun wear does not serve this lifestyle very well. Transitions lenses do not get dark in the car because the windshield blocks the UV light which activates the photo chromic response. Polarized sun wear blocks dangerous glare, but does not change in…
Remote Order Entry (ROE) can be very useful when placing orders after hours, on weekends and holidays. We receive the orders every 15 minutes. The orders are in our system immediately after they are received. This saves time, especially when the lens style needs to be ordered. ROE is compatible with almost all tracer. ROE…
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….
