Requirements of eyeglass frames

Monday, November 23rd, 2009 at 3:43 pm Post in Eyeglasses

The size of eyeglass frames also has standard format, such as 48-19-140. The first number is the size of the lenses and the second number represents the bridge size. The third one indicates the temple length. Different wearers require individual frame measurements and fitting. With these standardized size measurements, manufactures can provide accurate eyeglass frames.

Some high myopes find that they can see better with plastic frames rather than metal ones with nose pads. The distance between the back surface of the lenses and the front of the eyes is named vertex distance, which can be increased by nose pads in metal frames. Plastic frames with decreased vertex distance are more for highly myopic people.

Some eyeglass wearers are sensitive to silicone, which can be found in the nose pads of eyeglass frames, resulting in red skin, irritation or blister-like sore. Vinyl nose pads are recommended to avoid silicone sensitivity. Indeed, the weight of eyeglass frames is also critical. Light and well-adjusted frames impose less pressure on the nose. Some eye doctors also suggest contact lenses.

Certain parents want to get special sun clips for their children’s particularly small frames of sunglasses. But in most cases, those custom-made clips are quite unaffordable. Fortunately, there is an optimal option for these bothered parents. Photochromic lenses combined with polycarbonate materials are the best solution for children who need well UV protection. This type of eyeglasses eliminates the extra expense of sun clips and also offers best UV protection and safety.