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Geographic and Product Data (Details 1) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2016
Apr. 03, 2015
Product Information [Line Items]    
Net sales $ 19,269 $ 18,858
ICLs [Member]    
Product Information [Line Items]    
Net sales 13,180 12,255
IOLs [Member]    
Product Information [Line Items]    
Net sales 5,067 5,358
Core products [Member]    
Product Information [Line Items]    
Net sales 18,247 17,613
Other surgical products [Member]    
Product Information [Line Items]    
Net sales $ 1,022 $ 1,245