paraxial
adjective
par·ax·i·al
(ˈ)par-ˈak-sē-əl 
: relating to or being the space in the immediate neighborhood of the optical axis of a lens or mirror
paraxial rays
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“Paraxial.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/paraxial. Accessed 22 Dec. 2024.
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