A frame that was adjusted before measurement may not remain identical after prescription lenses are mounted. Real lenses differ from demo lenses in mass and thickness, and mounting introduces new mechanical forces into full-rim, semi-rimless and rimless systems.
Pre-fitting and final fitting therefore have different jobs. The first creates a measurement reference; the second verifies that the finished eyewear still sits in the intended optical position while remaining comfortable and stable.
01 · MOUNTING STRESS
Lens size and mounting method can change frame geometry
In a full-rim frame, an oversized edged lens can spread the eyewire, alter front curvature or change temple splay. An undersized lens can create looseness or retention problems.
Semi-rimless frames depend on groove quality and cord tension, while rimless frames depend on drilled holes, slots, bushings or fasteners. Each mounting system needs its own mechanical check.
02 · WEIGHT BALANCE
The finished lens can change the load on the nose and ears
A large or high-power prescription lens can add more front weight than the demo lens. A forward shift in the centre of mass can increase nose-pad pressure, slipping or demand on the temple bends.
Final fitting therefore checks whether the frame remains stable during normal movement, not just whether it looks level on the bench.
03 · FRAME ALIGNMENT
Recheck the front, bridge, hinges and temples after mounting
Look for front twist, eyewire distortion, abnormal hinge load and uneven temple opening after the lenses are inserted.
Bench symmetry is only a reference. Natural facial asymmetry should not be “corrected” by forcing the frame into a shape that sits worse on the actual wearer.
04 · WEARING POSITION
Evaluate the finished pair at the nose, eyelashes, cheeks, temples and ears
Check whether the heavier finished pair slides lower, touches eyelashes or cheeks, or creates new temple pressure. Bridge support and temple bends can then be refined.
A large adjustment can also change fitting height, vertex distance or tilt, so mechanical comfort changes must be considered together with the optical measurements.
05 · OPTICAL RECHECK
Progressive and individualized lenses should be compared with the original measurement position
If a progressive fitting cross no longer aligns closely with the intended pupil position, or a personalized lens is worn at very different position-of-wear values, the finished condition no longer matches the order assumptions.
First restore the frame as close as practical to the original measured position. If the difference remains large, recheck monocular PD, fitting height and any relevant wear parameters.
06 · DELIVERY TEST
Final fitting also includes a practical visual check
Have the wearer use distance and near vision, and intermediate vision when relevant, without needing to hold the frame unnaturally high or low.
Some adaptation can be normal, but major complaints should not automatically be labeled adaptation. Recheck prescription, centration, lens design, edging and fitting in sequence.
SOLUTION GUIDE
GLANOS measurement and fitting check
Inspect eyewire, groove, drill and cord systems.
Check the finished front load.
Recheck bridge, hinges and temples.
Adjust nose, width and ear support.
Confirm fitting height and wear parameters remain close to the order condition.
Verify practical distance, intermediate and near use when relevant.
GLANOS LENS CHECK
Pre-fitting creates the measurement reference; post-edging fitting verifies the finished product
The final adjustment should improve comfort while preserving the optical position that the lenses were ordered for as closely as practical.
CAUTION
Recheck measurements after any large delivery adjustment
Progressive, individualized and high-power lenses can be more sensitive to positional changes. A major frame shift is not merely a comfort issue.
GLANOS EYEWEAR
Eyewear discomfort has a reason.
eyeglass fitting · lens edging · lens mounting · frame distortion · progressive lenses · fitting height · final inspection