Optical Techniques in Medical Glasses: Understanding the Boxing System
Explore the significance of the Boxing System in optical measurements for medical glasses. Learn about key measurements like A, B, DBL, DBC, and more to ensure proper fitting and vision correction. Discover the impact of the Optical Manufacturers Association's adoption of this system in 1962.
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Presentation Transcript
Al-Mustaqbal University Department/ Optical techniques Medical glasses Medical glasses 3rd stage By Dr. Marrwan Hisham Mohammed 2024/03/04
Boxing Boxing System 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 outermost edges of the shape.
Boxing System Boxing System A" Measurement The horizontal distance between the furthest temporal and nasal edges of the lens shape The A measurement is also commonly known as the eye size.
Boxing System Boxing System B" Measurement The vertical distance between the furthest top and bottom edges of the lens shape or the distance between the horizontal sides of the box.
Boxing System Boxing System Datum Line - The horizontal line that runs through the vertical center of the frame. Geometric Center (GC) - The intersection of the Datum Line and horizontal centers of each lens shape.
Boxing System Boxing System Distance Between Lenses (DBL) - The shortest distance between the nasal edges of each lens or the distance between boxes. DBL is also commonly referred to as bridge size.
Boxing System Boxing System Distance Between Centers (DBC) The horizontal distance between the geometric centers of the lenses. DBC is also know as the Geometric Center Distance (GCD), but more commonly referred to as the frame PD.
Boxing System Boxing System Note: Frames are typically marked for size, for example: 54-18, where 54 is the "A" Measurement and 18 is the DBL.
Boxing System Boxing System Effective Diameter (ED) Twice the distance from the geometric center of the lens furthest edge of the lens shape.
Boxing System Boxing System Seg Height The vertical distance between the bottom edge of the box and the top of the bifocal or trifocal segment Seg Drop The vertical distance between the Datum line and the top of the bifocal or trifocal segment Overall
Boxing System Boxing System Thank you
