Cybercopyedit, Optics, Alhazen, etc. 

Hi. About Cybercopyedit's changes to Optics: This isn't sockpuppetry. I complained that his previous username did not comply with policy and he handled it by creating a new one, which is one of the recommended ways to deal with that problem. 

I think he may have a valid point about Alhazen's book. The article's previous statement that the book merely "documented the then-current understanding of vision" does not appear to be supported by the reference that was already cited in the article. I took a quick skim through the parts of it that are freely accessible earlier today, and it appeared to show that Alhazen's work significantly expanded on the previous understanding of the subject. Based on that one reference (not contributed by Cybercopyedit as far as I know), it appears that a stronger statement of Alhazen's contribution is warranted. I'll take a closer look when I have a chance.