I am 50 years old and having farsighted power of +1.5 along with nearsighted power of +2.00 on both the eyes from last 10 years till 6 months back, when last time I got my eyes checked. Recently during health check up, I found than my right eye farsighted vision has changed to (-ve( 0.75 although left eye vision remain unchanged. Nearsighted vision also remain unchanged in both the eyes..After changing my power in the glass , I am feeling little dizziness since last 7 days(seems like balance problem)..What may be the cause? .Also, is the drastic change in right eye power from +ve to -ve can have some underlying reason, which may be something serious?