Lens ordering and verification

Gauri S Shrestha, M.Optom

Lens ordering, verification and trouble shooting


Markings

Distance power & prism

Addition

Fitting cross heights & PDs

Delivery1. Pre-delivery Verification


Delivery ..



Checking the addition


Checking the fitting cross heights and monocular PDs



Delivery ..

On eye assessment

Frame fit Fitting crosses


Delivery ..

On eye assessment

Distance Vision Near Vision


The steps for solving progressive problems 1. Question the patient 2. Re-mark the lenses and check the powers 3. Check the frame fit and fitting cross

positions 4. Watch the patient using the lenses

Summary


Sources of errors ...

Heights

Monocular PDs

Swapped lenses

Wrong power & axis


Complaints & Remedies...

PROBLEM

Blurry Distance Vision

Possible Causes

Fitting too high

Incorrect Rx

Remedies

Open the nose pads

Remake lenses



PROBLEM

Blurry Near Vision

Possible Causes

Fitting too low

Inadequate pantoscopic tilt

Incorrect Rx

Remedies

Bring in nose pads

Frame adjustments

Remake lenses



PROBLEM

Swimmy Sensation

Possible Causes

Incorrect PD & heights

Inadequate pantoscopic tilt

Facial Wrap

Adaptation

Remedies

Increase facial wrap

Pantoscopic tilt



PROBLEM

Reading area too small

Possible Causes

Incorrect PD

Fitting heights too low

Remedies

Frame adjustments

Refit lenses



PROBLEM

Having to look to the side to read

Possible Causes

Incorrect PD

Swapped lenses

Remedies

Refit to correct PDs

Swap lenses if frame symmetrical



PROBLEM

Having to tilt head too far back to read

Possible Causes

Incorrect PD

Add too weak

Change in design

Remedies

Bring in nose pads

Increase the add

Refit lenses



PROBLEM

Having to tilt head backward for distance

Possible Causes

Undercorrected hyperope

Overcorrected myope

Remedies

Repeat the refraction

Refit lenses



PROBLEM

Having to tilt head forward to read

Possible Causes

Add too strong

Remedies

Repeat the refraction

Refit lenses



PROBLEM

Having to tilt head forward for distance

Possible Causes

Fitting height too high

Remedies

Frame adjustment

Refit lenses


Locating hidden engravings

Use a black back ground

Fluorescent Bulb

Optical hidden circle finder

PAL ID


Digital lens meterPUPILLARY HEIGHT MEASURES


PDS KIT

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Lens ordering and verification