01 · FRAME POSITION
A new frame may place the lenses differently from the old one
Different bridge height and frame width can change wearing height and the distance between the eyes and lenses.
Even with the same prescription, a higher or lower frame position or a different vertex distance can make vision and comfort feel different.
Even with the same prescription numbers, a new frame can change how the lenses sit in front of the eyes. Vertex distance, pantoscopic tilt, frame wrap, and fitting height can matter more in high prescriptions and in designs optimized for the actual wearing position. Before labeling discomfort as “prescription adaptation,” compare the old and new position of wear.
02 · LENS POWER
A prescription change can alter visual sensation
Changes in myopia or hyperopia correction, astigmatism power or axis can make floors, objects or spatial relationships feel different at first.
Larger changes may require a period of adaptation.
Comparing sphere alone can miss important prescription changes. Cylinder power and axis, left-right balance, and prescribed prism can change spatial perception and the way the wearer uses the lenses. Some wearers need time to adapt, but substantial or persistent discomfort should prompt verification of the prescription and manufactured lens values rather than simply extending an arbitrary adaptation period.
03 · LENS DESIGN
The lens design may also have changed
Changing from spherical to aspheric lenses, from single-vision to progressive lenses, or between progressive designs can change peripheral vision and head movement patterns.
Progressive lenses are particularly sensitive to wearing height, pantoscopic tilt, vertex distance and frame alignment.
A new lens design can change where clear zones are located and how peripheral vision feels. Progressive designs in particular distribute distance, intermediate, near, and peripheral unwanted astigmatism differently, so an immediately familiar eye-and-head movement pattern is not guaranteed. Design differences, however, should not be used to dismiss every blur or dizziness as normal; fitting height, centration, and prescription should be checked first.
04 · VERTEX DISTANCE
Has the distance between the lens and eye changed?
Vertex distance changes the effective wearing relationship between the lens and eye.
With higher prescriptions, a change in vertex distance can be felt more strongly, so compare the new and old glasses.
The effect of vertex-distance change generally becomes more relevant as lens power increases, but discomfort cannot be explained by one distance alone. Pantoscopic tilt, wrap, and centration can change at the same time. Compare the whole position of wear rather than treating a single measurement as the complete cause.
05 · FITTING OR ADAPTATION
Separate fitting problems from visual adaptation
Severe nose pain, pressure on only one temple or an obviously tilted frame are not typical visual adaptation issues.
A new prescription or lens design can feel unfamiliar and may need time.
If discomfort does not improve, or if there is severe dizziness, double vision or visual discomfort that interferes with daily activities, recheck lens power, centration, design and the fitting instead of assuming it is normal adaptation.
Adaptation varies with the wearer and lens design, so there is no single fixed period that applies to every new pair of glasses. Verify prescription, cylinder axis, left-right lenses, centration, fitting height, and frame alignment before deciding that the remaining difference is adaptation to a new optical condition. Severe double vision or persistent visual disturbance should not be managed by repeated frame adjustment alone and warrants appropriate eye-care evaluation.
SOLUTION GUIDE
Solutions at a glance
Compare wearing height and vertex distance.
Consider adaptation while reviewing what changed.
Check fitting first.
Recheck the lenses and fitting.
GLANOS FITTING CHECK
GLANOS fitting check order
- Front
Check frame alignment. - Nose pads / bridge
Check wearing height and vertex distance. - Width
Make sure the frame remains stable. - Temple bend
Make sure the wearing position does not keep changing.
CAUTION
Do not assume every problem is adaptation
Some visual changes need time, but severe pain or persistent visual discomfort deserves a recheck. With progressive and high-prescription lenses, actual wearing position is as important as the lens itself.
GLANOS EYEWEAR
There is a reason glasses feel uncomfortable.
new glasses · adaptation · vertex distance · pantoscopic tilt · lens power · progressive lenses · eyewear fitting