When you are making a choice for your new eyeglasses, the frame and the lenses have to be considered to get the best in appearance, comfort, clarity in vision and eye safety. There are a huge number of lens and frame choices, that can confuse anyone. While the frame usually depends on the wearer’s preference of design and comfort, choosing the right lenses is very important. Here, we help guide you through the different lenses available in the market, their features, and how they can suit your needs. The following information applies to all sorts of prescriptive lenses, so follow the tips to have the best optical experience you can have.

Features of Different Lens Materials

  1. Glass Lenses: The original choice for eyewear. Glass lenses can give really good optics. However, they are heavy and prone to breakage. This puts the eyes at risk of damage, which is also why glass is not used a lot for making eyeglasses.
  2. Polycarbonate Lenses: This material has been used since the 1970s to make safety glasses. Although not very common in vision-corrective lenses, they are the ideal choice for children’s glasses, and sports glasses, due to their low weight and high resilience to impact.
  3. Plastic Lens: Plastic lenses are slightly heavier than polycarbonate lenses. However, they provide excellent optics, which is why they are very popular for eyeglasses, at relatively low prices.
  4. High-index Plastic Lens: High-index plastic lenses are thinner and lighter and give really great optical clarity. Therefore they are in high-demand, for modern eyewear in all measures.

Index of Refraction and Abbe Value

The index of refraction indicates how fast light can pass through the lens, ranging between 1.49 to 1.74 depending on the material of the lens. Accordingly the higher the refractive index, the thinner and lighter the lens, so this affects the lens quality as per the requirement of the wearer.

On the other hand, the Abbe value is the amount of dispersion of lights into different wavelengths, which can result in the optical error of colored halos around objects, especially light. This value ranges between 59 and 30, and you should always try for lenses that have a higher Abbe value.

Aspheric Design and Edge Thickness

The aspheric design is the value assigned to how much flat the curve of the eyeglass lens is. The flatter the curve, the lesser the magnification of your eyes, resulting in a better appearance. However, this quality in your lens also increases the price you have to pay.

Depending on safety standards of the eyeglass manufacturer, the lens can only be ground to a certain minimum thickness, without compromising on the strength to prevent breakage. The size and shape of the frames and the material being used for making the lens are the major attributes that must be considered for this. High index aspheric lenses used in smaller frames will usually be the thinnest.

Treatments on Lens

For lenses that provide the most comfortable vision, durability, and appearance some treatments are needed. Anti-scratch coating is exceedingly important for long-term durability, but you should also ask for a warranty, to have the best longevity. An anti-reflective coating is also an important treatment that you should consider for your glasses. This increases contrast and clarity, which are important especially at night. This treatment is more important in high-index lenses as they tend to have more glare unless the anti-reflective coating is applied. In addition to this one can also go for UV-blocking treatment and photochromic treatments which protect your eyes from the harmful rays of the sun.

Before choosing an eyeglass pair, it is important that you consult a doctor so that you get best results, and Atharva Netralaya eye hospital can provide these services accurately at affordable prices.