This document discusses frame measurement and marking systems. It describes the datum and boxing systems for measuring frames, noting key terms like mid-datum depth, datum center, and A, B, C markings. It also lists specific measurements taken, such as effective diameter, frame difference, and temple length including length to bend and front to bend. Finally, it outlines common frame markings including eye size, manufacturer information, and gold classifications from fine to gold filled or plated.

1. Frame Measurements
And Markings
-Manthan Mishra
S.Y. B.Optom
Roll No 10

2. Introduction
• Two system is use most
1.The Datum System
2.The Boxing System
The Datum System is previously used
system(base system).
The Boxing System is now commonly used
system.

3. The Datum System
Mid-Datum Depth
Datum Center
Datum Line

4. The Boxing System
. “A”
“B”
“C”
DBL
ED
GC
Datum Line
GCD
Seg Drop
Seg Height
Seg raise
Seg Depth

5. Measurement
• Effective Diameter
• Frame Difference
• Distance Between Lenses
• Geometric Center Distance
• Seg
– Seg Height
– Seg Drop
– Seg Depth

6. Temple Length
• Overall Temple Length
-Length to Bend(LTB)
-Front to Bend(FTB)

7. .
Overall Temple Length
Length to bend
Front to bend

8. Frame Markings
• Eye Size and DBL
• Location of Markings
• Frame Manufacture Name,Color, and Country
of Origin
• Safety Frame Markings

9. Gold Classifications for Metal Frame
With Substantial Gold Content
Name
• Fine Gold
• Solid Gold
• Gold Filled
• Gold Plating
• Gold Flashing
Meaning
• 100% pure gold
• Gold pure base metal
evenly mixed throughout
• Base metal inside a “solid
gold” coating
• A base metal thinly plated
with gold
• A base metal with gold
thinly and quickly applied in
a manner similar to that of
gold plating

10. • Fine Gold
• Solid Gold
• Gold Filled
• Gold Platting
• Gold Flasbing
.

12. .

15. Reference
Dispensing Borish
Chapter 2;Page No 17-23
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