After frame selection or if we are putting replacement lenses into your existing frame, we still have to work together to choose eyeglass lenses, coatings and tints. Lenses are the most important part of your eye wear. You can face an overwhelming challenge when it is time to choose your lens type for your prescription eyeglasses.
Wohl opticians explain the different lens formats for you, whether it is single vision, bifocal trifocal or progressive. If reading glasses or computer glasses are warranted, we will customize the vision range that will work perfectly for you whether for reading a book, using a computer, working on a tablet computer or looking at your cell phone.
We are versed in designing and manufacturing specialty eye wear for musicians, plumbers, golfers and welders whose vision needs are not within the customary ranges.
There has been a change in the materials and technology used to create lenses. Lens selection decisions are key to how well you will see and how much you’ll spend. We will tailor your lens selection to your individual needs, not just your prescription. At Wohl Optics we’ll ask about your lifestyle, discuss your options and help you find the very best solution for your prescription lenses.
Wohl Optics specializes in high definition digital, ultra-thin, and the hardest and most scratch resistant non-glare lenses. When is comes to lens selection, the expert opticians at Wohl Optics are prepared to help you select the best lens design, material treatments, and technology for your individual needs, prescription and budget.
We offer unsurpassed prescription accuracy. If you have had difficulty with getting a prescription that works for you, contact us.
No matter your age or vision requirements, Wohl Optics offers lens material and coating solutions to make sure you have high quality vision from your prescription lenses. From computer lenses to single vision lenses, to progressive lenses and specialty eyewear, we provide you the best vision technology for your eyes and your wallet.
Choosing the right lens material is crucial. We will guide you toward a lens material solution that’s right for you - such as basic low cost, impact resistance, UV protection, durability or the most attractive appearance. Because choosing your lenses is such an important decision, we will give you as much information as possible and help you decide which options are best for you.
Types of Eyeglass Lenses
Single Vision Lenses
Set for only ONE single viewing distance, which may be near, intermediate or distance. It is not uncommon to have single vision lenses for use as specialty eyewear.
These have three main zones for distance, intermediate and reading, so users can enjoy the convenience of not having to take their glasses on and off and can view all distances in one lens. Progressives provide a smooth, gradual change in lens strength for seeing well at any distance. Consider them if you need glasses for distance and reading and find the split screen of bifocals or trifocals uncomfortable.
Bifocals are sectioned into two distinct parts, which give the user clear distance and near (generally), with no transition or correction in between.
Much thinner and lighter than ordinary plastic lenses, these have ten times more impact resistance than standard lenses and screen out 99.9% of the sun’s harmful UV rays. Recommended for children and safety glasses, or those who are a little tougher on their glasses.
High Index Lenses
Ideal for strong prescriptions but without the bulk of the thickness, feature an anti-reflective coating and provide 99.9% UV protection.
Standard lenses that can be given an anti-reflective coating to screen out sun harmful rays. With ordinary plastic lenses, a strong prescription can result in a thicker, lens. In contrast, high-index lens material will reduce lens thickness for greater comfort and a better appearance.
High Definition Lenses
Offer sharper vision and better peripheral vision than standard technology. You might want to opt for them if you have more complex visual problems,
Scratch Resistant — generally a good idea for all—comes with 95 percent of plastic lenses. Check the warranty; retailers such as Warby Parker will replace lenses that get scratched in the first year after purchase free of charge.
Anti-reflective coating — often bundled with high-index and HD lenses, used to be hard to clean and smudge-prone but now has anti-smudge/anti-fog technology. If you have trouble seeing properly when on a computer, driving, and at night, consider them.
Ultraviolet protection — good idea for most people because the UV rays from the sun may boost the risk of cataracts. Most lenses already come with this coating; make sure yours do.
Photochromic coating — darkens in sunlight and shields you from UV rays. It’s helpful if you’d rather not carry separate sunglasses.
Blue-light-blocking coating — might reduce exposure to computer screens’ LED light. (Some studies suggest that overexposure can damage the retina and increase the risk of age-related macular degeneration and cataracts.)
The newest material to be used in prescription eye wear. PPG named the material Trivex because of its three main performance properties. They are more scratch-resistant than either CR-39 or polycarbonate lenses. They can be useful if you wear rimless or semi-rimless frames, or if you are hard on glasses.
The three main properties are 1) superior optics 2) ultra-lightweight 3) extreme strength.
Thinner and lighter than standard plastic lenses
HIGH INDEX Lenses
Because high index lenses can form prescriptions using less physical material, they provide lenses that are both lighter and thinner than identical lenses formed out of standard glass or plastic. If you have a very slight corrective prescription, you might not enjoy much of a boost here; however, the stronger your prescription gets, the more benefit you will receive. Lenses that would be extremely thick and heavy if made of standard material can be considerably thinner and lighter if formed of high index material.
High Index lenses have a reduced edge size which also relates to the thinness of the high index lens. A thick standard glass or plastic lens will have edges that stick out from behind your frames.
High Index Advantages
Lighter and thinner than standard plastic lenses
Perfect choice for strong prescriptions, especially high minus prescriptions
High Index material allows for thinner center thickness and thinner edges
High Index Disadvantages
Higher cost than alternatives
More brittle and reflective
Polycarbonate lenses are made from a tough High Index material and is one of the most shatter resistant lens materials available today. Polycarbonate is the material used in bullet-proof glass. Developed in the 1970s and widely used until Trivex came along. Polycarbonate hit the market during the 1980s for use in common eyeglasses and offered an impact-resistant lens that was not bulky or uncomfortable.
Polycarbonate Lens Advantages
Polycarbonate lenses are thinner and lighter than standard plastic lenses.
20% thinner & 30% lighter than standard plastic lenses
12X more impact resistant than standard plastic lenses
Provide 100% UV protection
Lightweight - very comfortable to wear
Perfect material for the active life style of today's children and adult. Polycarbonate lenses for children eyeglasses because of the material’s durability, UV protection, and shatter resistance.
Polycarbonate Lens Disadvantages
Susceptible to scratches and requires scratch-resistant coating for durability.
Polycarbonate lenses can also cause chromatic aberration. Chromatic aberration occurs when the eye or an optical system fails to focus light of different colors or wavelengths at the same point, causing vision to be less sharp or distorted around certain objects.
Unlike Trivex, polycarbonate lenses are not made in the same way as traditional eyeglasses. The material is a thermoplastic and begins its life as small, solid pellets. Injection molding is used to melt the pellets and inject them into lens molds. Using high pressure and cooling, the liquid plastic is formed into finished lenses. The entire process takes only a few minutes. Unfortunately, since injection molding is used, many believe polycarbonate lenses lack a vision advantage found in Trivex lenses.
PLASTIC (CR-39) 1.5 Index Lenses
The most common optical polymer in the ophthalmic field. CR-39 lenses revolutionized the optical industry when they were first introduced in the 1940s. These lenses are half as heavy as glass, but far less likely to shatter. Plastic can be uniformly tinted to meet your needs. However, the disadvantage is that the CR-39 material is 20% - 35% thicker than polycarbonate or high index plastic lenses.
Plastic (CR-39) Lens Advantages
The CR-39 prescription lens material provides very little distortion - more than glass but less than polycarbonate.
CR-39 is more lightweight and thinner than glass- comfortable to wear.
More ore impact resistant but it may still break and shatter upon impact. Not recommended for active sports.
Plastic (CR-39) Lens Disadvantages
20%-35% thicker than polycarbonate or high index plastic lenses. This is significant in stronger prescriptions.
In relation to newer materials, glass is the heaviest but also THE most scratch resistant of all lens materials. Not only do glass surfaces highly resist the degrading scatter of fine scratches, they are also immune to the effects of contact and exposure to household solvents such as alcohol, acetone or the caustic pH of common cleaning agents, including oven and wheel cleaners. And no matter how you choose to clean them, glass lenses do not need the careful approach required of other materials. In fact, glass lenses stored without a case will, with just a few quick wipes, look like a million bucks when the return to duty calls.
Glass Lens Advantages
Most scratch resistant of all lenses. No need for added scratch protection coatings.
Optical clarity is excellent.
Wohl Optics does all edging for glass lenses in-house.
Glass Lens Disadvantages
Glass is the least impact resistant of all lens materials.
Glass offers very little protection against harmful UV rays, which can destroy your eyes. We can coat them for UV, however.
Additional UV coating needs to be applied to make glass acceptable for sunglass use.
About Wohl Optics Vision Care
Work with a real-life optician in a real-life shop, where you receive warm, professional service and a high quality, yet affordable product. Family owned and operated best in Bucks County Optical and Optometry eye care practice. Direct, personal consultation with the person who is not only helping you, but also designing, manufacturing, performing quality assurance and dispensing your eye wear.
We are not satisfied unless we exceed your expectations. We hope you’ll drop by to browse, discuss the latest in lens technology, get expert advice, or just to say hello. Talk about music, news, family, or restaurants with Doug Wohl. After all, we are all members of the same community.