Maps for Diagnosis and Prediction

  <more vision>|<more difficult>
100          s +
               |
               |
               |
               |
90             +
               |
               |
               |
               |
               |
80           s +
               |
               |
           f s |
             s |
       s s s s |
70       f s s +
               |
               | read signs at night
       f s s s | oncoming headlights
   s s s s s s |
             s | night driving       see faces
60             +
             f | medicine bottles  thread needle
             f |
       f f s s |
               | moving objects & night driving
           f f | teletext
50         f f +
             s | drive unfamiliar areas
             s | read food cans
               |
               | newspapers  read signs daytime
             f |
40           f +
               |
             f |
               | daytime driving
             f | television
             f |
30         f s +
               |
               | write checks
               |
               |
               |
20             +
               |
               |
               |
               |
             f |
10             +
  <less vision>|<less difficult>

The "bilateral cataract" patients are waiting for first (f) or second (s) eye cataract surgery. The line at 60 units roughly divides "f" from "s" patients. It indicates an expected vision level after first surgery. Vision may be good enough for day-time driving, but not for night-time.

Pesudovs K., Garamendi E., Keeves J.P., & Elliott D.B. (2003) The Activities of Daily Vision Scale for cataract surgery outcomes: Re-evaluating validity with Rasch analysis. Investigative Ophthalmology & Visual Science, 44, 7, 2892-2899.

Maps for Diagnosis and Prediction, Pesudovs K., Garamendi E., Keeves J.P., & Elliott D.B. … Rasch Measurement Transactions, 2003, 17:3 p.935

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