Difference between revisions of Guide:Reducing lens complexity

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(Left Eye/Right Eye differentials were swapped (I think))
(→‎How to reduce lens complexity: Changed the example to a table.)
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Either type of reduction can be applied to [[spherical]] power or [[cylindrical]] power.
Either type of reduction can be applied to [[spherical]] power or [[cylindrical]] power.


There are three rules for reducing complexity:
'''There are four rules for reducing complexity:'''
# <div>Alternate types of reductions. Simple -> Equalizing -> Simple -> Equalizing...</div>
# <div>Alternate types of reductions. Simple > Equalizing > Simple > Equalizing...</div>
# <div>Change only spherical or only cylindrical and never both simultaneously</div>
# <div>Change only spherical or only cylindrical and never both simultaneously.</div>
# <div>When equalizing, change both differential lenses and normalized lenses simultaneously to keep the [[focal planes]] in sync.</div>
# <div>For an equalizing reduction, change both differential lenses and normalized lenses simultaneously to keep the [[focal planes]] in sync.</div>
# <div>For a simple reduction, change differential lenses a few weeks after normalized lenses to keep changes to [[focal planes]] to a minimum.</div>


'''Example'''


Normalized
'''A note on rule 3 and rule 4:''' Keeping focal planes in sync is a higher priority than keeping changes to focal planes to a minimum, thus rule 3 exists.


Left Eye: -3.50 > -3.25 > '''-3.25''' > -3.00
{| class="wikitable" style="text-align:center;"
Right Eye: -4.00 > -3.75 > '''-3.50''' > -3.25
|+ Example Spherical Reduction Schedule
 
|-
Differentials
! colspan="2" | Normalized
 
! colspan="2" | Differentials
Left Eye: -2.25 > -2.00 > '''-2.00''' > -1.75
! style="text-align:left;" | Explanation
Right Eye: -2.75 > -2.50 > '''-2.25''' > -2.00
|-
| Left
| Right
| Left
| Right
| style="text-align:left;" |
|-
| -3.50
| -4.00
| -2.25
| -2.75
| style="text-align:left;" | Starting point
|- style="text-align:left;"
| colspan="4" style="text-align:center;" | wait 4 - 8 weeks
|
|-
| -3.25
| -3.75
|
|
| style="text-align:left;" | Simple: perform normalized reduction
|- style="text-align:left;"
| colspan="4" style="text-align:center;" | wait 4 - 8 weeks
| rule 4
|-
|
|
| -2.00
| -2.50
| style="text-align:left;" | Simple: perform differential reduction
|- style="text-align:left;"
| colspan="4" style="text-align:center;" | wait 4 - 8 weeks
|
|- style="font-weight:bold;"
| -3.25
| -3.50
| -2.00
| -2.25
| style="text-align:left;" | Equalizing: both norms and diffs are reduced simultaneously (rule 3)
|- style="text-align:left;"
| colspan="4" style="text-align:center;" | wait 8 - 16 weeks
|
|-
| -3.00
| -3.25
|
|
| style="text-align:left;" | Simple: perform normalized reduction
|- style="text-align:left;"
| colspan="4" style="text-align:center;" | wait 4 - 8 weeks
| rule 4
|-
|
|
| -1.75
| -2.00
| style="text-align:left;" | Simple: perform differential reduction
|- style="text-align:left;"
| colspan="4" style="text-align:center;" | wait 4 - 8 weeks
|
|- style="font-weight:bold;"
| -3.00
| -3.00
| -1.75
| -1.75
| style="text-align:left;" | Equalizing: both norms and diffs are reduced simultaneously (rule 3)
|- style="text-align:left;"
| colspan="4" style="text-align:center;" | wait 8 - 16 weeks
|
|}


==References==
==References==
Retrieved from "https://wiki.reducedlens.org/wiki/Guide:Reducing_lens_complexity"