01 · OVERSPREAD
The temples may spread farther than during normal wear
For many wearers, the temples open more on top of the head than they do at the normal temple area.
If this is repeated, the basic spread and left-right balance can change.
The glasses may then feel looser when returned to the face.
If the head is wider than the frame’s normal wearing position, placing glasses on top of the head can spread the temples farther than ordinary use. The important factors are not a single motion alone but the amount of spread, how long it is maintained and how often it is repeated.
02 · HINGE STRESS
The hinges also receive outward force
If the frame is opened widely on the head, the hinges and endpieces can experience greater outward force than in normal wear.
Spring hinges allow extra movement within a designed range, but they are not intended to be kept repeatedly over-spread.
A spring hinge does not mean unlimited outward travel is harmless. The spring mechanism allows movement within a designed range, but load is still transmitted through the endpiece, hinge and temple, so repeated over-spreading is best avoided.
03 · METAL FRAME
Metal temple angles can change
Thin metal temples have elasticity and recovery, but repeated large spreading forces can change their resting angle and left-right spread.
If one side changes more, the frame can later drift or rotate.
04 · ACETATE FRAME
Plastic frames can change shape too
Acetate is more susceptible to shape change in high-temperature environments.
If the temples are held widely spread while the frame is also exposed to high ambient heat, the chance of deformation can increase.
Body heat alone should not be treated as the sole cause; repeated over-spreading and high temperature are the more relevant combination.
Acetate is a thermoplastic material that can be heat-adjusted, so shape change becomes easier at elevated temperatures. Normal scalp warmth alone should not be treated as sufficient proof of deformation; greater concern is warranted when high ambient heat and excessive spreading occur together for a sustained period.
05 · SLIPPING
The result can be a looser, more slippery fit
If side width increases, lateral support on the face can decrease.
The frame may move forward more easily, place more demand on the nose and slide down.
What looks like simple slipping can sometimes be related to repeated storage or wearing on top of the head.
If the frame becomes loose, first inspect temple spread, hinges and front alignment rather than immediately increasing the bend behind the ears. When the underlying problem is excessive temple spread, stronger rear restraint can leave the basic width problem unchanged.
SOLUTION GUIDE
Key points at a glance
A case is the most stable option when practical.
Keep the lens surface off the table.
Reposition the frame so pressure is not asymmetric.
Check temple spread and overall alignment.
GLANOS FITTING CHECK
GLANOS fitting check order
- Front
Check the frame for twist. - Nose pads / bridge
Check whether nose support changed. - Width
Compare temple spread. - Temple bend
Recheck rear support.
CAUTION
Putting glasses on your head once does not instantly deform them
The concern is repeated and prolonged over-spreading. With acetate frames, high-temperature conditions can further increase the chance of shape change.
GLANOS EYEWEAR
There is a reason glasses feel uncomfortable.
eyewear care · glasses on head · temple deformation · hinge · slipping glasses · frame deformation