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https://www.youtube.com/watch?v=jdcVl63hxNQ
https://www.youtube.com/watch?v=FkOzu_Xz5RM
When my doctor would insert my plugs he would use the slit lamp method. He would have me put my head in the chin/headrest and then look at my eye through the microscope so he could see how he was inserting the plug and then he could also check the plug was properly inserted when he was done.