Measuring Instruments

Flexible steel with engraved millimeter scales.

Tapered end fits into eyewire groove for accurate readings. 6-1/4" long by 15/32" wide.

Rules To Abide By

"A PD rule can be much more than a simple measuring stick. Check out the features on our selection of rules. You will surely find one that makes your dispensing or lab task easier and more accurate. All American made where a 70mm reading on the scale is 70mm in reality."

See other options below, or view all PD Rules

Sturdy white plastic with both millimeter and inch scales in black.

Beveled for comfort. 6-1/4" long by 37/64" wide.

Rules To Abide By

"A PD rule can be much more than a simple measuring stick. Check out the features on our selection of rules. You will surely find one that makes your dispensing or lab task easier and more accurate. All American made where a 70mm reading on the scale is 70mm in reality."

See other options below, or view all PD Rules

Sturdy white plastic with millimeter scales in black.

Millimeter markings read in the same direction for accurate PD measurements. 7-1/4" long by 11/16" wide.

Rules To Abide By

"A PD rule can be much more than a simple measuring stick. Check out the features on our selection of rules. You will surely find one that makes your dispensing or lab task easier and more accurate. All American made where a 70mm reading on the scale is 70mm in reality."

See other options below, or view all PD Rules

Sturdy red plastic with both millimeter and inch scales in white.

The ends of this rule are notched for easy and accurate eyewire measurements. White numbers on red field run in opposition so that the rule always reads in the correct direction. 7-1/4" long by 11/16" wide.

Rules To Abide By

"A PD rule can be much more than a simple measuring stick. Check out the features on our selection of rules. You will surely find one that makes your dispensing or lab task easier and more accurate. All American made where a 70mm reading on the scale is 70mm in reality."

See other options below, or view all PD Rules

Curves Worth Knowing.

The higher the patient’s Rx, the more important the base curve be specified in the Rx. A dramatic change in the curvature can cause the patient problems. This clock provides precise curvature measurements on glass and plastic lenses. Rounded steel tips prevent scratched lenses. +\-20 diopters. Self-adjustable re-calibration.

Too big? Too small? Just right!

Determining the correct size replacement screw is a frustrating, time consuming task. It’s the “Goldilocks” dilemma. The first screw you try is too large, the next is too small. You want to find the right screw the first time. Western Optical Supply has exactly what you need to quickly determine a replacement screw size.

With the Goldilocks Screw Gauge™ spend less time replacing screws and more time selling eyewear.

The Goldilocks Screw Gauge™ is a precision milled steel probe graduated in six “steps” of increasing diameter. Insert the gauge through the barrel’s bottom threaded leaf until it feels snug. Note which “step” is in the barrel. Compare that “step” to the sizing chart provided to determine the proper replacement screw diameter. The colors on the chart correspond with most major screw suppliers’ color code on the cap of the screw vial. If your color coding is different, there is a chart on the reverse that you can customize with your own color code. US Patent #960004S1.

Insider Info from Joshua

For years, Western has been asked to carry a line of screws. I have been very hesitant to get involved in offering a product that does not have a competitive advantage. In response to these requests, we researched what innovation would be needed in the world of eyeglass screws.

 What we found is that the industry does not need another line of screws, but it does need a time saving way of determining the proper screw size.

The old-fashioned screw gauge measures the size of the barrel hole but does not consider the added dimension of the screw threads. A 1.2mm hole does not use a 1.2mm replacement screw. Therefore, it gives only a rough starting point.

Western Optical Supply went to work designing an accurate and easy to use probe that correlates to the correct screw diameter. However, to manufacture the Goldilocks Screw Gauge required advanced technology. To mill stainless steel on this micro scale with precision tolerances within 0.005” down to the tip of an ever thinning spindle is a technical feat. The resulting gauge will make the task of replacing screws much less of a chore.

The Goldilocks Gauge™: easy, fast and accurate.

Dispensary scaled version constructed of corrosion resistant brass and stainless steel.

Has deep jaws for use on lenses up to 86mm in diameter and 15mm thick. Scale is in 10th millimeter increments. Soft spring and Delrin plastic tipped jaws protect the lens.

7-3/8" long.

So much better than a PD stick! 

The Manual Pupilometer is the quick way to take accurate measurements of a patient's monocular and binocular interpupillary distance (PD). The higher the prescribed lens power, the greater the need for precise PD measuring. Reduces costly do-overs due to inaccurate measuring. Keep one on hand as backup when your digital pupilometer is non-functional.

All polycarbonate construction. Comes with easy-to-follow instructions. Made in USA.

Three rules PLUS a pinhole occluder.

Use the scales on this rule to measure binocular PD, monocular PD, seg height, bridge, DBL of frame and eyewire A and B dimensions. A pinhole occluder tests visual acuity. 7-3/8" long by 1" wide.

Rules To Abide By

"A PD rule can be much more than a simple measuring stick. Check out the features on our selection of rules. You will surely find one that makes your dispensing or lab task easier and more accurate. All American made where a 70mm reading on the scale is 70mm in reality."

See other options below, or view all PD Rules

Verify. Verify. Verify.

Every job you get back from the lab needs to be verified. Place your eyewear with spotted lenses on the Rx Verifier, aka prescription axis aligner, to check both the monocular and binocular PD. You can also determine seg height and check that the seg is level.  6” W x 2” H x 1” D.

Insider Info from Joshua

"This isn’t the only RX Verifier on the market but it is the best. Here’s why. We moved the printing to the backside of the plate so it won’t wear off. By having you assemble the unit, you can position horizontal zero exactly how you like it. We significantly expanded the base plate to make it easier to hold eyewear in place when taking readings. Simple but proprietary tweaks so you get years and years of use." 

Accurately measures bifocal placement from the pupil to the lowest point on the eyewire.

Really handy and accurate way to measure bifocal placement. Simply align the top of the cross bar under the patient's pupil and read the lowest point of the eyewire on the scale. For patients with a narrow PD just slide the rule so the scale is at the lowest eyewire  point and the wide crossbar will still remain directly under the pupil for truly accurate readings.

Minimizes miscommunication with the lab. Clear plastic with black scale. Also, great for taking box measurements.  7" long.

Rules To Abide By

"A PD rule can be much more than a simple measuring stick. Check out the features on our selection of rules. You will surely find one that makes your dispensing or lab task easier and more accurate. All American made where a 70mm reading on the scale is 70mm in reality."

See other options below, or view all PD Rules

Open Wide!

Laboratory grade caliper for measuring extra large and extra thick lenses.

Measures up to 25mm in 1/5mm graduations. Easy to re-calibrate. Precision constructed of stainless steel and brass. 7-1/2" long.