en:lenscatalog:version061001:lensgeo.dat
Table of Contents
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 lens | 1 | 6 | T6 | |
| 2* | Diameter of base lens | 7 | 4 | 9999 | 9999 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* | Elliptic | 11 | 1 | T1 | blank=round “E”=elliptic |
| 4* | Strongest principal meridian from | 12 | 5 | +9999 | +99.99 D Empty = geometry applies to all delivery ranges not specified |
| 5* | Strongest principal meridian to | 17 | 5 | +9999 | +99.99 D Empty = geometry applies to all delivery ranges not specified |
| 6 | Exact diameter in the vertical semiaxis | 22 | 4 | 9999 | 99,99mm Empty if value “0000” is indicated under Pos. 2, “Diameter of base lens”. |
| 7 | Exact diameter in the horizontal semiaxis | 26 | 4 | 9999 | 99,99mm Empty if value “0000” is indicated under Pos. 2, “Diameter of base lens”. |
| 8 | Near portion type | 30 | 1 | 9 | 0=C 1=S 2=Panto 3=round 4=Executive |
| 9 | Vertical distance to distance reference point (Room reference point for office lenses) | 31 | 5 | +9999 | +99.99mm: vertical distance from the geometric center of the base lens to the distance reference point. Superior positive |
| 10 | Max. horizontal distance to distance reference point (Room reference point for office lenses) | 36 | 5 | +9999 | +99.99mm: horizontal distance from the geometric center of the base lens to the distance reference point. Nasal positive |
| 11 | Vertical distance to dividing edge (Bifo / Trifo) | 41 | 5 | +9999 | +99.99mm: Vertical distance from the geometric center of the base lens to extreme point T of the near portion Inferior positive. |
| 12 | Horizontal distance to dividing edge (Bifo / Trifo) | 46 | 5 | +9999 | +99.99mm: Horizontal distance from the geometric center of the base lens to extreme point T of the near portion. Nasal positive |
| 13 | Vertical distance to the near portion center (Bifo / Trifo) | 51 | 5 | +9999 | Vertical 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. |
| 14 | Lower radius of near portion | 56 | 4 | 9999 | 99.99mm for bifocals /trifocals |
| 15 | Upper radius of near portion | 60 | 4 | 9999 | 99.99mm for bifocals /trifocals |
| 16 | Width of near portion | 64 | 4 | 9999 | 99.99mm for bifocals /trifocals |
| 17 | Height of near portion | 68 | 4 | 9999 | 99.99mm for bifocals /trifocals |
| 18 | Height of intermediate portion | 72 | 4 | 9999 | 99.99mm for trifocals |
| 19 | Max. vertical distance to distance centering cross (progressive lens) | 76 | 4 | 9999 | 99.99mm vertical distance from the geometric center of the base lens to the distance centering cross. Superior positive. |
| 20 | Centering to zero gaze direction or principal visual direction (progressive lens) | 80 | 1 | 9 | 0=zero gaze direction 1=principal visual direction |
| 21* | Maximum vertical distance to near reference point (progressive lens) | 81 | 4 | 9999 | 99.99mm 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) | 85 | 4 | 9999 | 99.99mm 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) | 89 | 4 | 9999 | 99.99mm 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) | 93 | 4 | 9999 | 99.99mm minimum horizontal distance from the geometric center of the base lens to the near reference point. Nasal positive |
| 25 | Variable decentration. Smallest decentration | 97 | 2 | 99 | 0= No variable decentration Value= smallest optical diameter. See LensRange.Dat file description |
| 26 | Min. horizontal distance to distance reference point (Room reference point for office lenses) | 99 | 5 | +9999 | +99.99mm: horizontal distance from the geometric center of the base lens to the distance reference point. Nasal positive (see also field 10) |
| 27 | Min. vertical distance to distance centering cross (progressive) | 104 | 4 | 9999 | 99.99mm 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