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19:2319:23, 3 March 2023 diff hist +379 Focal length Added figure for human eye. Primary example of lens system with distinct nodal point. Tag: Reverted
18:5318:53, 3 March 2023 diff hist +1,056 Focal length Definitions for focal length are ambiguous for a lens not in air, and a new peer-reviewed paper provides clarification. Tag: Reverted

19:2919:29, 12 October 2022 diff hist +104 m Cardinal point (optics) Undid revision 1109795169 by Srleffler (talk) The change was very nicely worded, but the original paragraph described something that appears to not be widely recognized. It is simply not possible for rays to satisfy the paraxial nodal point criterion for the eye at large angles, because they are stopped by the iris. Paraxial rays define the nodal point location, but it is real rays through the pupil center that create the image. Tag: Undo

17:1717:17, 24 January 2019 diff hist −152 m Intraocular lens Deleted a sentence that said that a Nepalese Dr was a founder of IOLs. It is great that he does a lot of surgery, but IOLs go back to Harold Ridley, mentioned in the history section, and a lot of effort by commercial organizations.