Most probably, this starts with a an untrue premise:
There are not so many laws about eye injury.
How many "laws" are there in the Hammurabi Code? — 282.
How many "laws" are there concerning consequences of eye injury?
One law for harm done by everyday accidents, brawls, malicious intent,
one for professional medical health & safety.
The "why" and ...
Because the circumstances are all different. In regards "blows and strikes":
 addresses loss of life, not blows per se.
 through  are all varying classes of assault under different circumstances.
The rest of this answer should assist you in interpreting the Code. Let's look closely at the laws pertaining to loss of an eye, in context: