Ho Optometrist

Your Local Optometrist from 怡保……Ipoh….. Perak, Malaysia

Importance of Spectacle Adjustments…

on December 7, 2012

Some thoughs to share among practitioners….

Ever wonder the reason why sometime patient’s chief complain for discomfort about the new pair of spectacles even though the prescription is all EXACTLY the SAME?

Question is… how similar is the fitting and design of the previous with the new frame… even given so its the same model and fit… still some will tell you its just not feeling right…..temple adjustments

Therefore, it is vital to check the fitting and adjustments of the frame.. In most cases for troubleshooting, a few tweaks will do the job. Just check the few areas if the lens is aligned… balanced? Any lobsided when the patient is wearing the spectacles? Is it pressing too much on either one side or both… Is the pantascopic tilt suitable and when the patient glances down towards the bottom of the lens, is the vertex distance ok? Is the nose pad fitted alright?

So… a good adjustment and fitting on a pair of spectacles is as important as the accuracy of the prescription… It doesn’t work if you have the best driver with a badly aligned car, right?

Helpful Adjustment Hints:

  1. Always hand a patient a new frame that is in standard adjustment.
  2. Keep all frames on the modules in good adjustment and clean.
  3. Always pre-adjust a frame before taking any measurement.
  4. Take time to ensure sure all adjustments are correct.
  5. Recommend that the patient return regularly for adjustments.
  6. Never put an anti-reflective lens in the frame warmer. Remove the lenses from the frame prior to heating.
  7. When adjusting frames always use a padded pliers or towel to protect the frame from scratches.
  8. When replacing nose pads, protect the lenses from scratches in case your pliers slip.
  9. Place the frame on a flat surface to prevent the screwdriver from slipping.
  10. Never put an anti-reflective lens in the ultrasonic cleaner.
  11. To loosen a locked screw, heat the screw in the warmer and melt wax around the screw.
  12. Don’t get discouraged!

Below are some explainations about some terms. Cheers.

DEFINTIONS:

Pantoscopic – the lens bottom is rotated towards the cheeks.

Retroscopic – The lens bottom is rotated away from the cheeks. Rotation of the lens, around the horizontal axis occurs in frames at the hinge so temples mounted at the top of a frame are rotated like the above illustration.

Lens tilt improves the way a lens works and contributes to how good a pair of glasses looks on the patient. Tilt is dependent on the interaction of the heights of the ears and bridge of the nose. So, even though a new frame has about 7 degrees of tilt when manufactured once lenses are added the frame may not appear to have any tilt at all unless it is well adjusted to the wearer beforeany measurements are taken.

So, when taking measurements for freeform or digitally enhanced lenses, place the frame on the patient, make sure the frame front is straight and lenses have about 10 degrees of tilt. The amount of tilt should look good i.e., correct for the way that this patient wears this frame.

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