Disaggregation of Sales, Geographic Sales and Product Sales - Net Sales by Products and Services (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Product Information [Line Items]
Total other product sales		$ (511)	$ (761)	$ (666)	$ 1,336
Total net sales		88,590	80,308	264,951	246,142
ICLs [Member]
Product Information [Line Items]
Revenue from contract with customer, excluding assessed tax		89,101	81,069	265,617	244,806
Cataract IOLs [Member]
Product Information [Line Items]
Total other product sales			(221)		1,295
Other surgical products [Member]
Product Information [Line Items]
Total other product sales	[1]	$ (511)	$ (540)	$ (666)	$ 41

[1] Other surgical products include delivery systems and normal recurring sales adjustments such as sales return allowances.