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Refractive Errors, Myopia, Hyperopia, Astigmatism - Coggle Diagram

- - - - low (3), mid (6), high (6^)
        
        Negative
- - - - Positive
- - - - Regular
      - with the rule
        
        I (+) , / (-)
      - against the rule
        
        I (-) , / (+)
      - Oblique
        
        45° / 135°
      - class.
        
        Simple
        
        1 (retina) & 1 (before/after)
        
        Compound
        
        2 (before/after)
        
        Mixed
        
        1 (bef. retina) & 1 (after)