I am a female in my late twenties with a problem called convergence
insufficiency. Last year I went to see an orthoptist who gave me this
diagnosis. My right eye drifts outwards at times, exophoria. I was
also given some eye exercises to do at home, which temporarily helped,
athough I admit I didn't have the time to continue them for more than
a few weeks. I was also prescribed a weaker prescription

I'm having the same problems again this year: my right eye is
deviating outwards when i read or do close work. I've never tried
prisms. One thing that helps is patching my good eye. However, I will
be going to see another orthoptist soon. Apparently the best
combination is VT and prisms. Can anyone give me any other advice
before I have my appointment?

Here are my prescription details over the past two years:

MAY 2004
Right eye sph: -2.00
Left eye sph: -2.25

Right eye cyl: -1.50
Left eye sph: -1.75

SEP 2005
Right eye sph: -2.50
Left eye sph: -2.75

Right eye cyl: - 1.75
Left eye cyl: -2.00

APR 2006
Right eye sph: -1.75
Left eye sph: -2.00

Right eye cyl: -1.25
Left eye cyl: -1.75

MAY 2007
Right eye sph: -5.00
Left eye sph: -5.00

Right eye cyl: +1.75
Left eye cyl: +2

(does the last prescription mean i have -3.25 and -3??)