III. Learn about the spectacle frames and    their size parameters

1. Explanation of frame size:

 

Rim size

The distance between the inside of two vertical lines    in the plane of the rim.    Generally it is 33-60mm

 

Frame height

The outside distance between upper and lower    edges of the rim.

 

Nose bridge size

The horizontal width of the nose bridge.

Generally it is 13-22mm

 

Outside width of the frame

The width of the visible area on the left and right sides of the    frame, i.e. the distance between two junctions of the frame    and legs.Generally, the outside width of the frame below    128mm is classified as small size, 129mm to 138mm is classified    as medium size, and more than 139mm is classified as large size.

 

Leg size

The horizontal distance from the center of the frame hinge    to the end of the glass legGenerally it is 125-156mm

You can know the proper frame size through the    following ways:

1) View the size directly. It is usually marked on the inside of    the left glass leg;

2) If the parameters on the glass leg have been worn, the    data can be obtained by measuring the existing glasses with    a ruler;

3) Check the previous purchase list of glasses and mark the    proper size for yourself.

2. How to choose the frame color

 

Whiter skin

Choose a lighter color frame        such as soft pink, golden and silver;

 

Darker skin

Choose a darker color frame        such as red, black, or tortoiseshell;

 

Yellowish skin

Avoid yellow frames        Mainly choose pink, coffee red, silver        and other light color frames;

 

Reddish skin

Avoid red frames        Choose frames in gray, light green,        blue and so on.

3. How to choose the type of frame

Full-rim frame

It has complete rims and the periphery of the lens is    completely protected by the rims.

It is suitable for lenses with various refractive parameters,    and is also suitable for athletes and children to wear

Half-rim frame

The upper part of the rim is made of metal or plastic material    The lower half of the rim is made of a very fine nylon wire    It is relatively light in weight and more businesslike.

Because the lower part of the lens has no rim to block, if the    lens edge is too thick, it will affect the appearance. Therefore,    this kind of frame is not suitable for high degree.

Rimless frame

There is no rim, only the metal nose bridge and the metal    legs. The lens and the nose bridge, and the legs are    directly fixed by screws.

Rimless frames are lighter and more chic than ordinary    frames, but its strength is slightly worse than that of the    full-rim frame. Such frames are not recommended for    children. Since connections of the frame are easy to loose,    and the length of the screws is limited, it is not suitable for    people with high degree to wear this kind of frames.

4. How to select frame materials

 

1) Plastic frame: it is mainly divided into two categories: PC    frame and board frame.The PC frame is light in weight, simple    in processing, good in molding, but easy to deform, poor    tensile and compressive strength;The board frame has bright    color and good tensile and compressive strength, but the    manufacturing process is complicated.

 

2) Metal frame: its characteristics are: strong, light, beautiful,    novel style, wide variety.Most are made of alloy, and some    may fade due to different electroplating processes. There are    also frames made of pure titanium and memory alloy frames.    Its advantages are anti-allergy, durable and anti-corrosion.

 

3) Mixed material frame: mostly made of mixed metal and    plastic.Combining the advantages of plastic and metal, it is    beautiful and light. Most of them have plastic frames and    metal legs, which are the main combinations that are popular    nowadays.

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