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en:lenscatalog:version061001:lensgeo.dat

LensGeo.Dat

Description

The geometric base data, reference points, centration lines and near portions are defined in the LensGeo.Dat file.

Table structure

No. Field name Pos Length Format Comments
1*Man. code base lens16T6
2*Diameter of base lens7499999999 or 99 with 2 blanks

00 with 2 blanks = geometry applies to all not separately listed centric diameters

0000 = geometry applies to all not separately listed non-centric diameters
3*Elliptic111T1 blank=round
“E”=elliptic
4*Strongest principal meridian from125+9999+99.99 D
Empty = geometry applies to all delivery ranges not specified
5*Strongest principal meridian to175+9999+99.99 D
Empty = geometry applies to all delivery ranges not specified
6Exact diameter in the vertical semiaxis224999999,99mm
Empty if value “0000” is indicated under Pos. 2, “Diameter of base lens”.
7Exact diameter in the horizontal semiaxis264999999,99mm
Empty if value “0000” is indicated under Pos. 2, “Diameter of base lens”.
8Near portion type30190=C
1=S
2=Panto
3=round
4=Executive
9Vertical distance to distance reference point
(Room reference point for office lenses)
315+9999+99.99mm:
vertical distance from the geometric center of the base lens to the distance reference point.
Superior positive
10Max. horizontal distance to distance reference point
(Room reference point for office lenses)
365+9999+99.99mm:
horizontal distance from the geometric center of the base lens to the distance reference point.
Nasal positive
11Vertical distance to dividing edge (Bifo / Trifo)415+9999+99.99mm:
Vertical distance from the geometric center of the base lens to extreme point T of the near portion
Inferior positive.
12Horizontal distance to dividing edge (Bifo / Trifo)465+9999+99.99mm:
Horizontal distance from the geometric center of the base lens to extreme point T of the near portion.
Nasal positive
13Vertical distance to the near portion center (Bifo / Trifo)515+9999Vertical distance from the geometric center of the base lens to the center of the circle describing the lower radius of the near portion.
Inferior positiv.
14Lower radius of near portion564999999.99mm
for bifocals /trifocals
15Upper radius of near portion604999999.99mm
for bifocals /trifocals
16Width of near portion644999999.99mm
for bifocals /trifocals
17Height of near portion684999999.99mm
for bifocals /trifocals
18Height of intermediate portion724999999.99mm
for trifocals
19Max. vertical distance to distance centering cross (progressive lens)764999999.99mm
vertical distance from the geometric center of the base lens to the distance centering cross.
Superior positive.
20Centering to zero gaze direction or principal visual direction (progressive lens)80190=zero gaze direction
1=principal visual direction
21*Maximum vertical distance to near reference point (progressive lens)814999999.99mm
vertical distance from the geometric center of the base lens to the near reference point.
Inferior positive
22*Minimum vertical distance to near reference point (progressive lens)854999999.99mm
minimum vertical distance from the geometric center of the base lens to the near reference point.
Inferior positive
23*Maximum horizontal distance to near reference point (progressive lens)894999999.99mm
maximum horizontal distance from the geometric center of the base lens to the near reference point.
Nasal positive
24*Minimum horizontal distance to near reference point (progressive lens)934999999.99mm
minimum horizontal distance from the geometric center of the base lens to the near reference point.
Nasal positive
25Variable decentration.
Smallest decentration
972990= No variable decentration
Value= smallest optical diameter.
See LensRange.Dat file description
26Min. horizontal distance to distance reference point (Room reference point for office lenses)995+9999+99.99mm: horizontal distance from the geometric center of the base lens to the distance reference point. Nasal positive (see also field 10)
27Min. vertical distance to distance centering cross (progressive)1044999999.99mm vertical distance from the geometric center of the base lens to the distance centering cross.
Superior positive

Notes

If the diameter (Field 2) is specified with “0000” or “00” and is therefore applicable to all diameters, the values for “Exact diameter” (Field 6/7) are not used or are also filled with “0000”.

en/lenscatalog/version061001/lensgeo.dat.txt · Last modified: 2019/06/14 13:16 by sebastianraring