Progressive lens fitting requires more than PD.
The vertical position of each eye in the worn frame matters because shifting the lens vertically changes where the wearer encounters the distance, intermediate and near portions.
01 · FITTING CROSS
Progressive lenses have reference markings for placement and verification
Designs include a fitting cross plus distance, near and prism reference points.
The fitting cross is used to position the progressive design relative to the eye; it should not be treated as the same thing as the optical center of a single-vision lens.
The fitting cross is a placement reference used to position the progressive design in front of the eye. It is not identical to the optical center concept used for a simple single-vision lens; distance verification, prism reference and near verification points have different roles.
02 · WEARING POSITION
Measure the frame in its actual stable wearing position
A frame sitting low on the nose produces a different apparent pupil height than a correctly adjusted frame. Fit the frame before measuring.
Fitting height is measured in the actual wearing position, not with the frame sitting on a bench. Adjusting nose pads, bridge position or temples can move and tilt the whole frame, so fitting should be close to final before the measurement is taken.
03 · TOO HIGH
Excessive height can compromise distance use
If the progression sits too high, added plus may enter straight-ahead viewing earlier than intended, prompting awkward head or eye positioning for distance.
If the design is positioned too high, straight-ahead gaze may encounter the progression or additional plus sooner than intended. Distance viewing can then feel restricted or require compensatory head posture, although symptoms still depend on prescription and design and should not be diagnosed from height alone.
04 · TOO LOW
Too-low placement can make near difficult to reach
If the near zone sits too low, the wearer may need excessive downgaze and may lose usable near area depending on frame depth and design.
If the design is positioned too low, the wearer may need to depress the eyes farther to reach the near zone. In a shallow frame, usable near area can also be reduced, so the answer is not simply to push the glasses up but to review the edging position and frame suitability.
05 · INDIVIDUAL HEIGHT
Right and left heights do not have to be identical
Facial asymmetry can place the pupils at different heights in the fitted frame. Some designs and measuring systems allow individual right/left fitting heights.
Faces and ear heights are not perfectly symmetric, so the actual pupil heights can differ between the two eyes. Some lens and measurement systems support separate right and left fitting heights. The objective is not forced symmetry but positioning each eye over the intended design.
SOLUTION GUIDE
Solution guide
Align the frame front.
Fit bridge or nose pads.
Set frame width and temples.
Stabilize the actual wearing position.
Measure the required fitting heights in that position.
GLANOS LENS CHECK
Changing the frame position after measurement also changes the reference
The measured wearing position and the real daily wearing position should remain as consistent as possible.
CAUTION
Fitting height is not simply the vertical center of the lens
It is determined from the wearer’s actual eye position and the fitting rules of the selected progressive design.
GLANOS EYEWEAR
There is a reason glasses feel uncomfortable.
progressive lenses · fitting height · fitting cross · pupil height · eyewear fitting · multifocal lenses