The best replacement for lazy eye is strabismus.

The best alternatives to lazy eye are rated as following:
★★★★★  strabismus
★★★★  amblyopia
★★★  cross eye
★★★  cross eyed
★★★  astigmatism
★★★  wandering eye
★★  squint
★  ptosis

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Speaking about lazy eye, one probably shouldn't forget about astigmatism.

Other search terms related to lazy eye and their ratings are:
★★★★★ astigmatism
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lazy eye
strabismus
amblyopia