Boxing System
In 1962 the Optical Manufacturers Association adopted the boxing system to provide a standard for frame and lens measurement that greatly improved upon the accuracy of previous systems. The boxing system is based upon the idea of drawing an imaginary box around a lens shape with the box's sides tangent to the outer most edges of the shape. The system uses the sides of the boxes as reference points for the standard system of measurements.
Read MoreTransposing Prescriptions
Depending on the equipment used by the doctor, a prescription may be in plus or minus cylinder form. For surfacing, the lab uses the minus form, meaning if a prescription is written in a plus cylinder form it must be transposed before processing.
Read MoreDispensing with the Y-Stick
Y-Stick assists the optician, using the traditional manual method of marking the fitting crosses. The measurement is consistent; as long as the customer assumes the same body posture, the measurement will be the same. Any subjectivity on the part of the optician has been removed.
The Dangers of Night Driving Glasses
It is an all too common misconception that yellow tinted or yellow polarized night driving glasses are beneficial for night time driving. The thought is, the yellow or amber color reduces glare and improves contrast. However, in reality, when driving at night or dusk in already limited lighting conditions, ANY tint further reduces the amount of light transmitted to the eye, and consequently, further impairs vision. The problem is compounded as the yellow tint gives the wearer the impression they are seeing better, when in fact the reverse is actually true.
Read MoreHarry A. Saake’s 44 Tips for Dispensing Opticians
1. If you have a high plus lens, stay away from long narrow frames as they will tend to pop out of those frames the easiest since they are long across the top. One must understand that one of the reasons for having trouble keeping lenses in a metal frame is the eyewire. When tightened the eyewire has a natural tendency to straighten. You can prove this by taking a piece of string, putting it into an arc and then pulling on both ends. That’s what your eyewire does and why there is more problem with plus lenses.
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