Since eyewear isn’t just about looking good, experienced staff will provide consultation of lens options in order to deliver a functional and aesthetically pleasing finished product. Ask about the free lenses offer for qualifying prescriptions.
Lenses bend and control light allowing for the user to see different perspectives. Simple lenses can’t form very sharp images so professionals achieve the proper magnification through combining the simple types to make complex lenses that perform better. This is done through the use of special computer programs because it can take millions of calculations to get the perfect look.
“CR39” – conventional plastic lenses; “Polycarbonate” – impact resistant plastic lenses that are great for work and sports safety needs, extra protection for children, and much more durable for rimless and semi-rimless frame applications. It’s also 20% to 25% thinner and as much as 30% lighter than conventional plastic lenses; “High Index 1.67” – approximately 40% thinner and lighter than conventional lenses, “High Index 1.74” – approximately 50% thinner than conventional plastic lenses.
“Trivex” – thinner than conventional plastic lenses, lighter and stronger and better optics than polycarbonate lenses. Next subcategory “Design” should list the following: “Single Vision” (SV) – prescription lenses calibrated for clear vision for a specific focal point of either distance vision or near vision. They can either be spherical lenses (with a uniform curvature throughout the lens) or cylindrical (with varying curvatures in the lens ehich is designed for patients with astigmatism),
“Mutlifocal” – Lenses with more than one focal point typically used by patients over 40 years old with presbyopia. These lenses come in a variety of designs but most commonly in a flat top bifocal segment design where the top portion of the lens allows the wearer to see clearly for distance vision and the added segment portion towards the bottom calibrated to allow the wearer to see clearly up close at approximately 16 inches away. Another popular multifocal lens design are Progressives. These lenses have no visible line separating 3 prescriptions incorporated in the design which allows the wearer to see clearly at varyinv distances of far, near and in intermediate.
Features and Options
Photochromatic Lenses – a feature that can be incorporated with various lens designs and materials that will cause the lenses to darken automatically when exposed to direct sunlight and will lighten and become clear when not in direct sunlight.
“Anti-Reflective Coating” – coating that can be applied to any lenses to eliminate glare on lenses that interferes with the quality of vision and improves the aesthetic appearance of the lenses.
Single vision prescriptions are the most popular lens types having only one power in the entire lens. Single visions are best for distance, near, and intermediate vision.
BIFOCALS & TRIFOCALS
Multifocal lenses are lenses that have more than one prescription on the same lens. The most common types of multifocal lenses are bifocals (which have 2 separate prescriptions, usually near and far) and trifocals (which have 3, near, intermediate, and far).
Progressive lenses are trifocal lenses with no visible line distinguishing the 3 different prescription areas on the lenses. They are also known as ‘invisible’ trifocals.