- 
        Signature
      
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        /s/ Samuel Gesten as attorney-in-fact for Patrick F. Williams
      
      
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        Stock symbol
      
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        STAA
      
      
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        Transactions as of
      
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        Sep 16, 2021
      
      
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        Transactions value $
      
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        -$713,765
      
      
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        Form type
      
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        4
      
      
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        Date filed
      
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        9/17/2021, 04:03 PM
      
 
     
   
 
  
    Transactions Table
  
  
    
      
        
          | Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes | 
      
      
          
            | transaction | STAA | Common Stock | Sale | -$714K | -5.12K | -16.66% | $139.38 | 25.6K | Sep 16, 2021 | Direct | F1 | 
      
    
   
  
    * An asterisk sign (*) next to the price indicates that the price is likely invalid.
  
  
    Explanation of Responses:
  
  
  
    Remarks:
  
  This filing reflects the sale by Mr. Williams of Common Stock of the Company pursuant to instructions contained in a pre-established Rule 10b5-1 plan.