What is meant when they say your prescription eye glasses may need slopoff (sp) ?

I went to pick up my new prescription eye glasses today following cateract surgery on one eye. I could not see clear with the glasses and was told they may have to do slopoff (sp) to the glasses because there is such a difference in my two eyes. What is slopoff (sp)?

What is meant when they say your prescription eye glasses may need slopoff (sp) ?
Slab-off: A type of lens surfacing process that creates prism in a portion of the lens surface and results in two optical centers. Often used to create vertical prism in the lower portion of one lens for the purpose of alleviating vertical imbalance at near. This process is also known as "Bicentric grinding". This is the most common option for correcting vertical imbalance. Vertical imbalance is a differential vertical prismatic effect between the two eyes. At near, this can be induced by right and left lenses of unequal powers when the wearer drops his or her eyes below the optical centers of the lenses.
Reply:"slab-off", as is slab-off prism. its a way to make glasses with vast differences in Rx between the two eyes or between the distance and near portions of the same eye. it minimalizes unwanted prismatic effect (or sometimes adds in desired prismatic effect)





http://www.opticourier.com/1webmagazine/...





http://www.youngeroptics.com/faq/faqslab...
Reply:slab off-prisms to help you from having diplopia or double vision
Reply:A slab off is just as explained above. A doctor might ask for Slab off to keep you from seeing double when you read.