How to adjust eyeglasses and fit frames?

Written by Optician Club on . Posted in Optician News, Optician Tools

Pre-fit Techniques
Pre-fitting a frame prior to taking measurements has a major bearing on how well the finished product performs for the patient. The pre-fit also provides the patient with their first impression of the optician’s skill level.

There are several steps involved in the pre-fit:

  • Adjust the nose pads, if present.
  • If a zyl frame without nose pads is selected, make sure the frame sits well on the bridge.
  • Make sure the size of frame selected is actually going to work for the lens style prescribed.
  • Apply the appropriate pantoscopic tilt (usually 5 to 15 degrees).

Note that for every two degrees of pantoscopic tilt added to the frame front, the optical center (O.C.) of the lens is effectively lowered 1mm. To make sure the visual axis of the eye coincides with the visual axis of the lens it is imperative that the necessary pantoscopic tilt be applied prior to measurements being taken. If the frame is not pre-fit, it opens the door for patients’ complaints of visual discomfort with their new lenses – See more at: http://www.2020mag.com/l-and-t/20088/#sthash.XvaUcLif.dpuf

Pre-fit Techniques
Pre-fitting a frame prior to taking measurements has a major bearing on how well the finished product performs for the patient. The pre-fit also provides the patient with their first impression of the optician’s skill level.

There are several steps involved in the pre-fit:

  • Adjust the nose pads, if present.
  • If a zyl frame without nose pads is selected, make sure the frame sits well on the bridge.
  • Make sure the size of frame selected is actually going to work for the lens style prescribed.
  • Apply the appropriate pantoscopic tilt (usually 5 to 15 degrees).

Note that for every two degrees of pantoscopic tilt added to the frame front, the optical center (O.C.) of the lens is effectively lowered 1mm. To make sure the visual axis of the eye coincides with the visual axis of the lens it is imperative that the necessary pantoscopic tilt be applied prior to measurements being taken. If the frame is not pre-fit, it opens the door for patients’ complaints of visual discomfort with their new lenses

STEP 1
Straighten the bridge eyewires are aligned, not propellered.

adjust eyeglasses and fit frames

Right eyewire is propellered back, left forward. Remove the propeller effect at the bridge first.

 

 

TOOL FOR STEP 1
For plastic and metal frames-use hands
For rimless-use two bracing pliers

adjust eyeglasses and fit frames  Two bracing pliers

 

 

 

 

 

 

STEP 2
Give the frame a slight face form bend. Make sure temples are near parallel.

adjust eyeglasses and fit framesFront us a smmoth faceform curve, temple just slightly narrower than parallel.

 

 

 

 

TOOL FOR STEP 2
For plastic frames-use hands
For metal frames-use a flat padded/round plier
For rimless-use a bracing plier and post end plier

adjust eyeglasses and fit framesGrasp the frame front as shaown, thumbs and first fingers firmly on the bridge. Add a smooth faceform curve to the front.

 

 

 

 

 

 

STEP 3
With the frame upside down, the top bar of right and left lenses touch the table and the top of both temple bends also touch the table at the same time, “four point touch”

Fitting framesFout point touch.

 

 

 

 

 

TOOL FOR STEP 3
For plastic frames and metal frames-uses a wide jaw angling plier
For rimless-use a bracing and padded double jaw plier

adjust eyeglasses and fit frames

 

 

 

 

 

 

STEP 4
Next, place frame right side up. Temple and bends (45º)should be the same angle and both touch the table at the same time.

Fitting frames  Four point touch.

 

 

 

 

 

TOOL FOR STEP 4
For all frames-use hands to adjust the temple bend.

adjust eyeglasses and fit framesWarm the zyl, then place the pointer finger under the bend position and with the thumb make a 45 degree bend.

 

 

 

 

 

 

STEP 5
Lastly, whrn closed, the temples shoud overlap each other. This confirms that the frames is completely symmetrical.

Fitting framesRght and left temple should close over each other

 

 

 

 

TOOL FOR STEP 5

adjust eyeglasses and fit framesGrasp the top/bottom of the hinge and firmlu rotate left or right to align temple closure.

 

 

 

 

 

 

If necessary, before STEP 5, you can tighten the screws on each side of the temple. Doing this will fix glasses that are sliding down your nose and will keep the lenses secure within the frames. And then fix the nose pads for comfort. If the eyeglasses sit too high on your face, the nose pads need to be moved apart. If the eyeglasses sit too low, then pinch the nose pads closer together.

Optician Club

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