Can you suggest specific workbooks I can't find?

The varied closework exercises *only* work with amblyopia if the good eye is occluded, either physically or chemically with eyedrops... Atropine was tried with some success, in a recent study.

"The near activities included hand-held computer games, homework, reading, computer work, and the use of workbooks designed for the study with mazes, and word finds. Vision improvement in the eye with amblyopia occurred over a period of six to 24 weeks."

There's nothing magical about the workbooks. The important thing for each individual is that the material should be moderately testing:

not print so big it's easy, not so small it's almost impossible and discouraging.

That it's detailed interesting and persisted with is more critical that its exact nature, as far as I'm aware.

For example, one source recommended playing with Lego as being very effective for pre-schoolers .

If there's sufficient binocular vision to work 3D puzzles, any residual amblyopia requires no special treatment. Normal life will provide more stimulation than any specific activity.

(though 3D books are fun, and do tend to enhance binocular flexibility, a factor slightly removed from amblyopia)

Searching on-line gave remarkably few clues as to a specific book or publisher, though the Mayo clinic information was "cut and pasted" to various locations.