High power lens prescriptions are problematic and if you have a high power Rx you’ve probably had to live with them for a while. There are things you can do to minimize the unsightly thickness of your lenses following some simple rules of thumb.
First, a low power prescription is when the total power of the lens sphere and cylinder are less than 3.00 diopters of power in a lens. The higher the power goes above this value the more likely you lenses will have thick edges or unusually thick centers. As the total power of your lenses go up the more challenging it will be to hide the thickness. Here are some general rules of thumb to consider when purchasing frames and lens material for your prescription.
Usually, smaller is better. Think less wide, less tall, and the rounder the better for near sighted prescriptions. Round doesn’t always help farsighted patients but smaller is still a good idea for near or far sighted Rx’s to think smaller.
Avoid rimless and semi-rimless frame designs where much of the edge is exposed. Far sighted patients may find that their Rx makes edges very thin so it is best to avoid the frames that expose the edges. Full frames are best, generally speaking.
As your Rx power goes up you should also move up in material “index” value. For example, standard plastic lenses are almost twice as thick as 1.67 High index lens material for the same prescription.
Frames will vary in their ability to help conceal edge thickness but generally speaking, plastic frames provide more cover for the edge than metal frames.
How the lens is edged and processed for your frame will be a great opportunity area for you in accomplishing a better edge profile. By offsetting the groove to distribute the lens to both the inside and outside sides of the frame, the thickness of the lens is made far less obvious. When buying lenses ask for edging that helps balance the thickness for the best aesthetic appearance.
In combination with item (5) above, another helpful technique is referred to as edge painting. Basically the thick lens edge is painted or stained with a color that matches the basic frame material and along with the edging technique noted in (5), and can provide an excellent way to minimize edge profile. While this applies mostly to myopic patients it has value for fashion conscience eyeglass wearers of all kinds who simply want the best lens and frame profile that they can accomplish.
It is not a bad idea to make it a point to call the opticians at EyeglassUniverse.com for a confidential chat about how we can help you minimize the thickness of your lenses.