Amblyopia and Drivers Eye Test

I have amblyopia in my left eye.  Both if my daughters do, also.  When we take the DMV drivers vision test, we cannot see anything on the left eye side. It is just blank.  On a regular vision chart we can read down to the third or fourth line from the top with this eye.  And can see the remaining lines, just cannot read them.  I do not understand why this happens at the DMV, other than I know it has something to do with the machine we have to look into.  Could you please explain this?
PS Because of this happening at the DMV, they insist we are leagally blind in this eye (which isn't so) and have to have a restriction listed on our licenses.

[John C Hagan III, MD, FACS, FAAO]

answered else where.

[ReneeWest]

Thanks so much!

[John C Hagan III, MD, FACS, FAAO]

You are welcome.
JCH III MD