Fitting height is not a measure of whether someone has “high” or “low” eyes. It records where the eye or manufacturer-defined fitting point falls vertically inside the selected frame when that frame is worn normally.
The same wearer can therefore have a different fitting height in a different frame. That is why the frame position has to be stabilized before the height is measured.
01 · FRAME FIRST
Establish the real wearing position first
If bridge support, nose pads, frame width or temples are still unstable, the frame can move vertically. A height marked in that condition may not represent the finished glasses.
Holding the frame up by hand or measuring while the wearer lifts the chin can create a precise-looking number for the wrong position.
02 · POSTURE & GAZE
Use natural head posture and an appropriate fixation target
The measurer should be close to the wearer’s eye level while the wearer maintains a natural posture and looks at a distance target unless the lens protocol specifies otherwise.
Looking at the nearby examiner or tilting the head changes the relationship between pupil and frame. Digital systems have the same need for correct camera position and calibration.
03 · FITTING POINT
The vertical reference depends on the lens design and manufacturer
For progressive lenses, the fitting cross is generally aligned with the pupil centre and the height is recorded relative to the lens shape using the manufacturer’s ordering convention. The exact baseline or lowest-point convention should be confirmed for the system being used.
Not every single-vision lens requires a separately ordered fitting height, although some personalized, aspheric or high-power designs use vertical eye-position data.
04 · MONOCULAR HEIGHT
Right and left heights may legitimately differ
Ear height, nose support and facial asymmetry can place the two pupils at different vertical positions in the worn frame.
The goal is not automatically to force equal heights. First determine whether the difference comes from a twisted frame or from the wearer, then follow the lens design’s rules for separate heights.
05 · FRAME DEPTH
A correct height is useless if the frame cannot contain the lens design
Progressive lenses need enough vertical space for the selected design and near zone. Fitting height, frame B dimension and the product’s minimum fitting-height requirement need to be compatible.
Checking cut-out and minimum-height requirements at frame selection reduces the temptation to shift a fitting point later just to make the lens fit.
06 · RECHECK
Recheck the height after a major final fitting change
If the finished frame sits lower, or nose pads and temples are changed substantially, the actual location of the fitting cross changes as well.
Before delivery, compare the finished wearing position with the original measurement condition. A large difference should trigger a fitting or measurement review.
SOLUTION GUIDE
GLANOS measurement and fitting check
Stabilize the frame first.
Keep head and gaze natural.
Follow the specific lens manufacturer’s convention.
Record monocular heights when needed.
Check frame depth and minimum fitting height.
Confirm the finished frame did not move significantly.
GLANOS LENS CHECK
Fitting height is a wearer–frame relationship, not a fixed frame number
It changes with frame choice and wearing position, and its meaning is completed only when the lens design’s fitting reference is known.
CAUTION
Do not raise or lower the frame artificially just to obtain a preferred fitting height
A number measured in a position that will not be maintained during real wear does not describe the finished eyewear.
GLANOS EYEWEAR
Eyewear discomfort has a reason.
fitting height · progressive lenses · pupil height · monocular height · eyewear measurement · personalized lenses