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Frame Dimensions/Sizes
Lens Width: the width of the lenses, ensuring the frame fits the width of your eye and temporal bone.
Bridge distance: the distance between the two lenses, ensuring the frame fits your nose
Temple length: the length of the temple which are the whole parts hooking over the ears.
Lens Height: the vertical distance of the lens, frame for fitting bifocals or progressive lens should be at least 32mm in height.
Total Width: the width of the frame in a full frontal view, ensuring the frame fits the width of your face.
Small frame with a total width less from 120mm to 129mm
Medium frame with a total width less from 130mm to 139mm
Large frame with a total width of 140mm and above.
When purchasing single vision eyeglasses, wearers with higher prescription strength should be aware that large frame with wider lens is not recommended while smaller and narrower lens width will contribute to a thinner edge, lighter weight and greater comfort.
- 1. Applying higher index lenses (1.60 index and above) can solve the problem of having a thick edge on the Negative lens or a thick center of the Positive lens. These higher index lenses are not only thinner and lighter, but being aspheric will effectively perfect your vision effect and wearing comfort.
- 2. For the farsighted wearers （There is "+" in front of SPH value）who want to select the higher index lens above the 1.60 index, please avoid choosing big frame with wide lens because the higher index positive lens is with a smaller diameter (55mm) which might be insufficient to be polished based on the frame with wild lens, the frame with the lens width of 50mm or shorter is recommended.
- 3. For the wears that have a comparatively small PD (the distance between your pupils is less than 58mm), please pay more attention to the total width of the size as larger frame may not match your PD. Smaller frame with the lens width of 50mm or lower should be considered as the first choice in order to make sure the accuracy of your prescription.
Standard numbers of eyeglass frame size
Typically there will be three standard numbers imprinted on one of the temples or the bridge, indicating respectively the sizes of three frame parts. A typical example is 50-21-142. All sizes are marked in millimeter.
The first number 50 represents the lens size, which is also called eye size or lens width. Lens width is the most exact name of this size, describing precisely the distance between the vertical sides of a rectangle containing the lens shape. It is important to differentiate it from lens height. A large lens for a big guy usually has big sizes at both dimensions. Lens size typically ranges from 44 to 52. In rare cases, big and tall guys need to take a frame with a size of 58.
The second number 21 represents the bridge size. Other sayings include bridge length and bridge width. In detail, it is the minimum horizontal distance between the nasal surfaces of the rims. This size varies only slightly because people's noses will hardly differ significantly. When the frame is sitting too high on the face, it is necessary to increase this bridge size. In opposite, a shorter bridge is needed when the frame sits too low on the face.
The third number 142 describes the length of an arm or temple. This is the whole length of a temple, consisting of the length to the bend and the length of the drop. Most people can get fit into a size of 140, but a big guy may require 155 and even more.
How to measure eyeglasses size
Get a metric ruler that is capable of measuring millimeters, the universal unit of measurement set by worldwide frame manufacturers and opticians.
Place the frame on a smooth table or level surface. It is acceptable whether the arms are closed or open.
Align the starting end of the ruler with the one side of the eye rim at the outer edge, and measure the distance to the other side of the eye rim. The bridge length can be measured in a similar way.
It is necessary to measure the length to the bend and the length of the drop respectively.
At some online optical shops, customers are required to provide the frame sizes according to personal facial size. This is the necessary information for opticians to fit a pair of comfortable glasses.
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