What animal has the most eyes?

I read somewhere that a box jellyfish has 24 eyes.

http://www.answerbag.com/q_view/992692

A box jellyfish does have 24 eyes, of four different types.

https://www.sciencedaily.com/releases/2011/04/110428123938.htm

But the scallop beats that hands down!

Patinopecten caurinus (weathervane scallop) has about 100 eyes even as a small little bi-valve.

http://www.thenakedscientists.com/forum/index.php?topic=11486.0

This book describes the structure and function of the eyes, and mentions pn p 138 that the niumber of eyes varies even within a single species of scallop, and is not a function of size - his highest eye count was 111, on one of the smaller specimens of Patinopecten opicularis that he studied.

http://books.google.com/books?hl=en&lr=&id=1qvoa2ULLD4C&oi=fnd&pg=PR7&dq=Patinopecten+caurinus+eyes&ots=BeOfC9jZFU&sig=GjHRTKgsMTG7rKY_6Anb_n7OWWw#v=onepage&q=eyes&f=false

So, how much does a scallop see with his 60 or 100 or so eyes?
Nobody's sure.

"...about sixty primitive tiny bright blue eyes eyes reside in rows along a scallop’s mantle edge to detect motion, light and dark. A scallop can easily regrow any lost or injured eyes. Although these eyes may or may not produce clear images, the ability to sense an object moving with the speed of one of the scallop’s predators allows the scallop to save its skin (or to be scientifically correct, its shells) by either shutting immediately or swimming away."

That, plus several excellent photos from:
https://www.smithsonianmag.com/science-nature/what-scallops-many-eyes-can-teach-us-about-evolution-vision-180972099/

"The middle fold (or sensory fold ) is much thicker, is pigmented, and is easily seen. It bears stalked green or blue eyes and a band of contractile sensory tentacles (Fig 12-115A).

"The eyes are complex and have many of the features of vertebrate eyes. The pale cornea is underlain by a pigmented, blue iris is visible from the outside. Inside, below the iris, is a lens, then a photosensitive retina, a pigmented layer, a reflective tapetum, and a nerve. The eyes in the region of the dorsal exhalant apertures remain exposed and functional, even when the valves are closed. The tentacles of the middle fold are muscular, extensible, and sensitive to touch."

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4445998/