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        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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        Aug 10, 2021
      
      
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        Transactions value $
      
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        -$351,450
      
      
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        Form type
      
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        4
      
      
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        Date filed
      
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        8/12/2021, 04:22 PM
      
 
     
   
 
  
    Transactions Table
  
  
    
      
        
          | Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes | 
      
      
          
            | transaction | STAA | Common Stock | Options Exercise | $0 | +5.12K | +18.21% | $0.00 | 33.2K | Aug 10, 2021 | Direct |  | 
          
            | transaction | STAA | Common Stock | Sale | -$351K | -2.5K | -7.52% | $140.58 | 30.7K | Aug 11, 2021 | Direct | F1 | 
      
    
   
  
    * An asterisk sign (*) next to the price indicates that the price is likely invalid.
  
  
    Explanation of Responses:
  
  
  
    Remarks:
  
  This filing reflects (1) the vesting of performance-based restricted stock awarded to Mr. Williams on August 10, 2020, with achievement based on the Corporation's satisfaction of pre-established financial metrics; generating $200M in revenue, calculated on a trailing 12-month basis and the passage of at least 12 months from the date of grant; and (2) the sale by Mr. Williams of Common Stock of the Company pursuant to instructions contained in a pre-established Rule 10b5-1 plan.