Reason: the height of the left and right temples is inconsistent; The bridge of the nose of the spectacle frame is deformed and inclined; The height of the wearer's ears is not uniform.
Influence: Because we can't see the optical center of the lens, it causes a certain prism effect, which leads to dizziness and fatigue. Doing so for a long time may lead to the deviation of the eye's gaze center.
2. Horizontal deviation of spectacle frame
Reasons: a. Most cases are caused by the inconsistency of the external opening angle of the temple, especially the deviation is relatively large, which is related to the opening angle; B. The left and right positions of the nose rest are inconsistent, which is easy to observe; C. The lengths of the bending points of the left and right temples are inconsistent, and the side is too short, so pull the glasses to one side; D The width of the left and right faces of individual wearers is quite different or the front and rear positions of the left and right ears are different.
Influence: Due to the inconsistency between the optical center of the lens and the peripheral degree, and the prism effect, dizziness and blurred vision will be caused, which will seriously cause the deviation of the central main viewpoint.
3. The height position of the spectacle frame is not suitable.
Reasons: A. The position of the nose rest does not match the bridge of the nose of the wearer; B. the length of the temple bending point is not suitable; C. the selected frame is too big or too small.
Effects: blurred vision, dizziness, eye swelling and other phenomena. Because you can't see through the center of the lens.
4. Temples are too loose or too tight
Reasons: The temples of the spectacle frame expand or contract; The frame surface of the glasses frame is too large or too small; The bridge of the nose of the glasses frame is deformed.
Influence: it will seriously affect the wearing comfort, and the tight temple will oppress the temple and cause swelling and pain.
1. Put your hands flat and take off your glasses.
Keep your hands flat and take off your glasses, which can keep the balance on both sides and is not easy to deform. Taking off glasses with one hand can easily lead to the deformation of the frame.
2. Skillfully adjust glasses with a hair dryer
When adjusting the plate and TR90 frame, it is necessary to adjust the amplitude. You can blow hot air with a home hair dryer first. Pay attention to moving the blower when heating, and don't aim at only one point. It is recommended to water the lens once to prevent it from overheating.
3. Unbalanced deformation of glass
When the temple is unevenly deformed, grab both ends of the glasses frame with both hands and slowly adjust your attention. There is no need to heat a small range of uneven frames.
sizing
When the frame needs to be enlarged, press the thumb in the middle of the bridge of the nose, gently press it carefully, and slowly spread the sides outward until it is comfortable to wear.
When the mirror frame needs to be adjusted, grasp both ends of the mirror frame with both hands, carefully bend it gently, and slowly close it inward until it is comfortable to wear.
Adjust tightness
When the frame is loosely worn, the temple parts are adjusted inward, so that the temple parts are retracted and hung on the ears more firmly.
When the spectacle frame is tightened, the hinge part of the temple is adjusted outward, which makes the glasses bigger and more comfortable to wear.
6. Adjustment decline
When the glasses slide down or the bridge of the nose is under heavy lens pressure, adjust the radian of the tail of the temple, so that the glasses frame can be fixed on the ear more firmly, and the center of gravity will also move backward, which can reduce the weight of the glasses sliding down and pressing the bridge of the nose.
7. Adjust the size of the nose pad
When the nose pad spacing is too large, reduce the nose pad spacing, otherwise, increase it.
8. Adjust the height of the nose pad
The bridge of the nose is too low. If the wearing frame slides down or the eyelashes touch the lens, you can lift the nose pad up slightly, thus raising the nose pad. If the bridge of the nose is too high and the frame is too high, you can lower the nose pad.