If the vision was a problem causing you to push, this can impact thinking such that your answers may be inconsistent. One can end up over-thinking and messing up.

I've had three NPAs. It is best to not push, even if the tester is trying to get you to work faster. Letting the answers flow naturally will give a more consistent score.

If the tester tries to push you and you are already being diligent, tell them to back off and that you are working as fast as your brain allows. It the pushing is because you are getting distracted in thought, accept the prompts.

Even with high validity scales, the interpretation by a biased tester can be twisted to put doubt on the validity. I scored near perfect on the validity scales (48 and 49 out of 50, 37 or lower indicates malingering) but the psych said I was faking because I had some very high and very low scales.

Would it help to cover one eye so convergence is not an issue? Have you practiced reading with one eye?