Troubleshooting & Best Practices

Corridor Issues

Use this guide when a progressive wearer can find distance but struggles with near, intermediate, corridor width, or head-position comfort.

Symptoms

Patient says the reading area is too low, too high, too narrow, or difficult to find.
Computer vision is limited unless the patient lifts the chin or leans forward.
Patient reports blur when walking, looking down stairs, or moving through peripheral areas.
Patient finds one eye easier than the other when reading through the corridor.

Seg height or fitting cross is not aligned with the patient’s actual wearing position.
Frame has insufficient B measurement or the corridor ordered does not match the frame and patient behavior.
Pantoscopic tilt, face-form wrap, or vertex distance changed after measurement.
The selected design prioritizes a zone the patient does not use most, such as distance over office work.
Monocular PD or inset is off, creating unequal corridor access between eyes.

Re-adjust the frame first, then re-check the fitting cross and laser markings.
Confirm minimum fitting height and recommended corridor requirements for the ordered design.
Measure monocular PDs and seg heights again with the frame in final wearing position.
Ask the patient to demonstrate reading, phone, dashboard, and computer posture in the office.
If intermediate is the main complaint, consider whether an office or occupational design would serve the task better than a general-purpose progressive.

Contact the lab if the fitting marks verify but the corridor still does not match patient use.
Provide the order number, fitting height, frame dimensions, corridor/design ordered, and the task distance that is failing.
Note whether the patient needs wider near, stronger intermediate, softer periphery, or shorter corridor access.

Never measure progressives before final frame adjustment.
Avoid very shallow frames for patients who need easy near access unless the design is selected for that frame.
Set expectations: progressive corridors require head movement, while occupational lenses can be better for long computer sessions.
For remake decisions, solve for the patient’s failed task, not only the technical measurement.