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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Apr. 16, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K/A    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Current Fiscal Year End Date --12-31    
Entity File Number 001-38365    
Entity Registrant Name EYENOVIA, INC.    
Entity Central Index Key 0001682639    
Entity Tax Identification Number 47-1178401    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 295 Madison Avenue    
Entity Address, Address Line Two Suite 2400    
Entity Address, City or Town NEW YORK    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10017     
City Area Code (833)    
Local Phone Number 393-6684    
Title of 12(b) Security Common Stock, $0.0001 Par Value    
Trading Symbol EYEN    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 88.0
Entity Common Stock, Shares Outstanding   50,957,869  
Auditor Firm ID 688    
Auditor Name Marcum LLP    
Auditor Location New York, NY