Vertical internal angle: the angle between the curved temple and the extension line of the temple on the coronal plane.
The nose pad of glasses directly affects the comfort of wearing. If it does not conform to the angle of the wearer's nose, it will make the bridge of the nose indentation, which will cause serious pain, or it will cause the center of the spectacle frame surface to deviate from the central axis of the face, resulting in discomfort.
Front Angle: The included angle between the long axis of the nose rest and the vertical line of the horizontal plane is generally 20-35 degrees.
Oblique angle: When viewed from above, the included angle between the plane where the nose pad is located and the normal of the mirror ring is generally 35 degrees.
Vertex angle: When viewed from the side, the included angle between the long axis of the nose rest and the back plane of the mirror ring is generally 10- 15 degrees.
Matters needing attention in the process of glasses fitting
For people who wear glasses, if a pair of glasses is not suitable for wearing, it should be reported to the optician in time, and the optician will adjust the frame according to these conditions to improve the wearing comfort.
For professional opticians, after customers have finished fitting glasses, they should observe and ask customers about their wearing comfort in time, and have the obligation to remind wearers to go back to the store regularly to maintain and maintain their glasses to ensure their wearing comfort.
After wearing glasses, if the frame is easy to fall off or the ear is tender, most of the factors come from the temples of the glasses: for example, the bending points of the temples are not suitable for the bending of the ears, the bending is not enough or too much, or the front and back; However, if the vertical angle is too large, it will cause discomfort to the head, and if it is too small, it will cause the bending point of the frame to be too long, and the outline of the head cannot be attached.