Disability cases for PCS are difficult to win in the US. Many use attorneys to present their case but employer based disability may not offer that option. Social Security uses standards set out in the Social Security Disability Blue Book in most cases. A big problem is the inability to objectively diagnose many PCS symptoms. They tend to discount patient claims as subjective.

Are you in the US working for a foreign company or ?

What doctors have assessed your convergence insufficiency and what treatments have they tried ? Can you use just one eye to read ?

Medical Examiners often are some of the least knowledgeable docs, at least in the US.

btw, I'd suggest seriously considering pressing on while asking for any help at learning ways to work with your limitations.