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Lenses

January 2017 Eyes/Optics

When Blue Light Strikes


Our eyes are designed specifically to process light and it’s difficult to think that over the course of a lifetime that light damages them. Here is the key thought: an “Excess” of high-energy light. Exposure to all types of visible and non-visible light happens continuously and it has a direct impact on our body and mind, some positive, some negative. It’s impossible to stop the transmission of light or to know which is the most valuable for our well-being. But, based on what we’ve learned, we can certainly filter what experts have learned as potentially damaging high-energy visible light and prevent it from harming us over a lifetime.
January 2017 Business

The Power and Politics Of The PD, Part Four of Four

If we look at the dynamics of oversight for prescription eyewear worldwide, we note how the regulatory atmosphere is changing with the arrival of online prescription eyewear. For example, in 2010, the Canadian Health Minister in British Colombia, responding to a court case involving a prominent online optical retailer, was prompted to review the current regulations concerning eyeglasses contained in the applicable Canada's Health Professionals Act.
December 2016 Business

The Power and Politics Of The PD, Part Three of Four

If we look at the dynamics of oversight for prescription eyewear worldwide, we note how the regulatory atmosphere is changing with the arrival of online prescription eyewear. For example, in 2010, the Canadian Health Minister in British Colombia, responding to a court case involving a prominent online optical retailer, was prompted to review the current regulations concerning eyeglasses contained in the applicable Canada's Health Professionals Act.
December 2016 Business

The Power And Politics Of The PD, Part Two of Four

The sale of eyeglasses has been the single greatest revenue generator for optical stores. But you can't begin the sale of glasses without first having an Rx, and eye exams are financed in large part through participation in vision care plans (VCPs). For most consumers, the scheduling of exams and availability of eyewear allowances is set through the VCP’s logistics.
December 2016 Business

The Power And Politics Of The PD, Part One of Four

Probably no question elicits more surprise and emotion from eye care professionals than when they're asked: “Can I have a copy of my Rx and PD?” Why? Because this innocent request is really an arrow aimed straight at the heart of historical "control" ECPs have had over the sale of prescription eyewear. If we step back and take a longer perspective, we can see that this is just the latest manifestation of a consumer empowerment process that began more than three decades ago.

November 2016 Lenses

Understanding The Limitation Of The “Grid Test “For Judging Lens Quality

With the growth of the Optical Heritage Museum over the last 3 years (thanks to my company Zeiss who sponsors it), I have been fortunate to have the opportunity to study much of the content of our vast collection of Ophthalmic lens advertising materials. These date back to before the turn of the 20th Century. Our archives house a very unique library of materials; and one thing I have been struck with is the many parallels between how we market lens products then vs now.

November 2016 Lenses

Big Or Small? One Size Doesn’t Fit All

Patients come in all different sizes, which can make fitting frames and lenses a dynamic process. Thankfully, the industry has solved many of these problems in a variety of ways. From large to small, manufacturers have an array of frames to fit every sized head.

November 2016 Lenses

Coping With Corridors, Part Three

In traditional progressive lenses, the designer defines a series of performance goals, including a target corridor length and reading add, fixed lens areas, along with a merit weighting of various optical errors, and then enters into an iterative process to figure out which elements of progressive surface should be manipulated to achieve these goals.

October 2016 Lenses

Coping With Corridors, Part Two

To begin the choice of a corridor length, start with your fitting height, and subtract 4mm to 5 mm, which allocates enough height for a minimum useful reading area. The difference left is a good approximate number to begin determining your target corridor length.
October 2016 Lenses

Coping With Corridors, Part One

In the new millennium, as free-form manufacturing overcame the economic and logistic limitations imposed by traditional progressive production, a cornucopia of lens design choices unfolded on the optical market.