Un qualified comments only I'm afraid, but....
Age and nature of the defect would help. Are you getting more long sighted or short sighted? Is there any astigmatism?
Was there always a tendency for the poorer eye to be a little lazy? So that what is happening now is just a worsening of a long term condition.
A precise assessment of the reason that your brain is causing the other eye to be ‘dominant' is needed. Can you improve the bad eye by spending time with the good one covered up. It only takes a few moments for you visual processing to start to ‘re-map'.
There has been some good help on eyesight just lately, but anyone will need plenty of information.