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The “+” and “-“ parameters are not specific to LOH equipment; but are linear adjustment values to calibrate the generator thickness whenever an older style manual generator is used with a blocking system that was not specifically designed for it. This is used in conjunction with the 2nd, 3rd, and 4th parameters of the LOH system variable in order to compute the adjusted thickness values for setting the manual generator.
“Y” -
If the diameter of the lens blank is > 72mm, a 63x10 block will be chosen
If the diameter is < 60mm, a 48x10mm block will be used
If the specified block size results in cutter crash, then block will be changed to 48x10
If the blank will “bottom out” in the block (due to height or curve), block size will be changed to 63x10, then 63x13, then 48x10, then 48x13
For resin multifocals, where the segment protrudes from the front surface of the lens, if the block rests on the segment (more than the allowable overlap specified in LOI), if current block diameter is 58, block will be changed to 63x10 (if true front curve is <= 8.75) or 48x10 (if the true front curve is > 8.75). Note that an additional check is done to ensure that the lens doesn’t “bottom out” on the block if it does, the height will be increased by 3mm to 13mm.
“0” - forces the block size to always be what is specified in the block height and diameter fields, and does not change block size based on cutter crash, segment placement, blank diameter, etc.
“1” -
If the diameter of the lens blank is > 81mm, a 63x10 block will be chosen
If the diameter is < 60mm, a 48x10mm block will be used
If the specified block size results in cutter crash, then block will be changed to 48x10
If the blank will “bottom out” in the block (due to height or curve), block size will be changed to 48x10, then 48x13
For resin multifocals, where the segment protrudes from the front surface of the lens, if the block rests on the segment (more than the allowable overlap specified in LOI), if current block diameter is 58, block will be changed to 63x10 (if true front curve is <= 8.75) or 48x10 (if the true front curve is > 8.75). Note that an additional check is done to ensure that the lens doesn’t “bottom out” on the block, if it does, the height will be increased by 3mm to 13mm.
“2” -
If the diameter of the lens blank is > 72mm, a 63x10 block will be chosen
If the diameter is < 60mm, a 48x10mm block will be used
If the specified block size results in cutter crash, then block will be changed to 48x10
If the blank will “bottom out” in the block (due to height or curve), block size will be changed to 63x10, then 63x13, then 48x10, then 48x13
For resin multifocals, where the segment protrudes from the front surface of the lens, if the block rests on the segment (more than the allowable overlap specified in LOI), if current block diameter is 58, block will be changed to 63x10 (if true front curve is <= 8.75) or 48x10 (if the true front curve is > 8.75). Note that an additional check is done to ensure that the lens doesn’t “bottom out” on the block, if it does, the height will be increased by 3mm to 13mm.
“3”-
If the diameter of the lens blank is > 86mm, a 63x10 block will be chosen
If the diameter is < 60mm, a 48x10mm block will be used
If the specified block size results in cutter crash, then block will be changed to 48x10
If the blank will “bottom out” in the block (due to height or curve), block size will be changed to 48x10, then 48x13
No adjustment is made for resin multifocals with this option.
“4” -
if the diameter of the lens blank is > 86mm, a 63x10 block will be chosen
If the diameter is < 60mm, a 48x10mm block will be used
If the specified block size results in cutter crash, then block will be changed to 48x10
If the blank will “bottom out” in the block (due to height or curve), block size will be changed to 48x10, then 48x13
For resin multifocals, where the segment protrudes from the front surface of the lens, if the block rests on the segment (more than the allowable overlap specified in LOI), if current block diameter is 58, block will be changed to 63x10
“5” -
No change in block size is made for large diameter blanks
If the diameter is < 60mm, a 48x10mm block will be used
If the specified block size results in cutter crash, then block will be changed to 60x11.8
If the blank will “bottom out” in the block (due to height or curve), block size will be changed to 60x11.8
No adjustment is made for resin multifocals with this option.
“6” - This option differs from Option “1”, primarily with respect to the selection of a 63 x 7 block, instead of 63 x 10 block.
If the diameter of the lens blank is > 81mm, a 63 x 7 block will be chosen
If the specified block size results in cutter crash, then the block will be changed to 48x10
If the blank will “bottom out” in the block (due to height or curve), the block size will be changed to first 63 x 10, then 48 x 10, then 48 x 13.
For resin multi-focals, where the segment protrudes from the front surface of the lens, if the block rests on the segment (more than the allowable overlap specified in LOI), if current block diameter is 58, the block will be changed to 63 x 7 unless the front curve is so steep that it will bottom out (in the 8.00 + range depending on the requested edge thickness), in which case it will switch to either a 63 x 10 or a 48 x 10. In extreme cases an additional 3mm may be added to make it 48 x 13.
“M” or “P” (for use with LOH MT1 generator ONLY)
If the diameter of the lens blank is > 72mm, a 63x10 block will be chosen
If the diameter is < 60mm, a 48x10mm block will be used
If the specified block size results in cutter crash, then block will be changed to 48x10
If the blank will “bottom out” in the block (due to height or curve), block size will be changed to 63x10, then 63x13, then 48x10, then 48x13
For resin multifocals, where the segment protrudes from the front surface of the lens, if the block rests on the segment (more than the allowable overlap specified in LOI), if current block diameter is 58, block will be changed to 63x10 (if true front curve is <= 8.75) or 48x10 (if the true front curve is > 8.75). Note that an additional check is done to ensure that the lens doesn’t “bottom out” on the block, if it does, the height will be increased by 3mm to 13mm.
Additional calculations are done to calculate the “MT1 Setting Radius” and “MT1 Setting Angle”
“7” (user defined selection rules) - This option allows the lab to set their own rules and priority for selecting blocks. See the “Surface Block settings” section for details on setting these up. If you select option “7”, but neglect to set up a sequence of blocks, Rx-Universe will revert to the block specified as the system-wide default. If a sequence is set up, the system-wide default block is IGNORED.
“N” - This defaults the blocking to use or “A” - These settings allow for the choice of either a SatisLoh Nucleo blocker .“A” - This defaults the blocking to use an or a SatisLoh ART blocker. See ART / Nucleo Blocking.
NOTE - For cutter crash calculations, the lens is checked along the axis of the thinnest point, and also along the spherical and cylindrical axes. Cutter crash often occurs on small frame sizes with a 58mm or 63mm block, but is not limited to these cases.
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