Business Segments and Geographical Information - Schedule of Revenue Information by Product (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 28, 2024	Dec. 30, 2023
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		$ 48,669	$ 51,869
Cyclo G6
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		12,697	13,461
Retina
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		27,827	29,445
Other
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues	[1]	$ 8,145	$ 8,963

[1] (1) Includes service contract revenues of $1,399 thousand and $1,534 thousand recognized during fiscal years 2024 and 2023, respectively. Includes $1,455 thousand and $1,455 thousand recognized revenue related to the exclusive distribution rights during fiscal years 2024 and 2023. Other also includes revenues from paid service, royalty, freight and legacy G probes.