Disaggregation of Revenues, Geographic Sales and Product Sales - Net Sales by Products and Services (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 29, 2023	Dec. 30, 2022	Dec. 31, 2021
Product Information [Line Items]
Total other product sales		$ 2,988	$ 14,679	$ 17,567
Total net sales		322,415	284,391	230,472
ICLs [Member]
Product Information [Line Items]
Revenue from contract with customer, excluding assessed tax		319,427	269,712	212,905
Cataract IOLs [Member]
Product Information [Line Items]
Total other product sales		1,139	9,638	12,519
Other surgical products [Member]
Product Information [Line Items]
Total other product sales	[1]	$ 1,849	$ 5,041	$ 5,048

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