01 · LOOSE SCREW
The simplest cause is a loose screw
If the screw has backed out slightly and created a gap, appropriate tightening may improve the hinge.
The simplest loose hinge is inadequate screw tension, but the joint still needs enough normal clearance for smooth movement. Tightening as hard as possible can damage the tiny screw head or threads and make the hinge unnaturally stiff.
02 · WORN HINGE
The hinge itself can wear
Repeated opening and closing can wear contacting metal surfaces.
In that case, tightening the screw may not completely remove the play.
Hinge knuckles rotate against one another and can wear. If holes enlarge or contact surfaces lose material, vertical play may remain even with correct screw tension, so screw looseness and hinge wear must be diagnosed separately.
03 · DEFORMATION
Mating hinge parts can become bent
Drops or repeated one-handed removal can load one side and change hinge alignment.
Dropping the frame or repeatedly removing it with one hand can twist an endpiece and hinge. Small alignment changes can alter left-right opening feel and side-load the screw, so the whole front and temple alignment should be checked.
04 · SPRING HINGE
Spring hinges are mechanically more complex
If the spring or internal parts fail, replacing a simple screw may not solve the problem.
Repairability and parts availability vary by model.
A spring hinge contains additional spring and sliding parts. If the spring breaks or the slider wears, tightening the visible screw cannot recreate the original action; repair depends on whether the mechanism is replaceable and parts are available.
05 · FRAME CONNECTION
The hinge can also fail where it joins the frame
A damaged acetate hinge insert or a broken weld on a metal frame requires a different repair from ordinary hinge looseness.
A hinge separating from the frame body is structural damage rather than ordinary play. Torn acetate around an embedded hinge or a failed metal weld means the load path itself is damaged, and any repair should be judged by restored strength and alignment.
SOLUTION GUIDE
If a hinge feels loose
Adjustment is often possible.
Inspect hinge wear.
Check alignment and deformation.
Inspect internal parts and repairability.
GLANOS LENS CHECK
Compare the left and right hinges
A large difference between sides can help identify the source of the problem.
CAUTION
Not every hinge can be restored to like-new condition
Depending on wear and frame damage, part replacement or frame replacement may be more appropriate.
GLANOS EYEWEAR
There is a reason glasses feel uncomfortable.
eyeglass hinge · hinge repair · spring hinge · eyeglass screw · frame repair