Step 1: Understanding the Concept
The cavity of the eyeball is split by the lens, not by the cornea.
Step 2: Check Statement I
The lens and its ciliary supports divide the eye into an aqueous chamber in front and a vitreous chamber behind. The cornea is only the front wall, so Statement I is incorrect.
Step 3: Check Statement II
Accommodation is the ability of the lens to focus near and far objects on the retina by changing its curvature. So Statement II is correct.
Final Answer:
Statement I is incorrect but Statement II is correct.
\[ \boxed{\text{(D) }\text{Statement I is incorrect but statement II is correct.}} \]