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• CNTF 3 month Update
• Posted: 2007-12-19 11:02:10 By Rick H
• I had my 3 month visit for the CNTF late stage implant study.. My vision score in my right eye was an average of 2 letters lower than at 1 month. The right eye score average was l.5 letters lower (Average of 3 tests) than at 1 month. Statistically I would say my eyseight is about the same as before I had the implant. Even my intial screening visits varied by 1 or 2 letters each time.
  
  I do get a few more "blue light" halo flashes in my left eye every once and a while. I always had these..they just seem a little more frequent. Also, in general my eyes seem a little more light sensitive since the operation.
  
  

• Re: CNTF 3 month Update
• Posted: 2007-12-19 17:55:28 By carolina s
• Rick
  What do you mean 2 letters lower ? I do not understand that expression , you mean you can read 2 letters smaller ? Lower in the 20/20 scale or all the oposite ?
  Tks !!
  carolina

• Re: CNTF 3 month Update
• Posted: 2007-12-19 18:49:37 By Rick H
• The letter count is based on the ETDRS vision test that we get as part of the CNTF study. 5 letters eguals 1 line on a standard vision test. If you wnat to learn more about the ETDRS vision test methodology you may want to google it. As part of the study, each eye is tested 3 times. The total letter count is taken each time and also the corresponding visual acuity (20/40..etc) Hope that helps....