on it him Useful as one of points of

on it him . Useful as one of points of fixing of a strong light source (or two light sources use has been found in 5-10 foots ( . . the foot is equal approximately 30,5 see) From each other). To the person when it he looks aside from a light source, it is easier to see its his less bright, than to see worse any black letter at a sight aside from it her .
Then in the subsequent will make the same with the letter much easier 16, .64 . Further it he describes one case which evidently illustrates the practical appendix told by it him .
The description of a way what has restored sight of the patient, can quite serve as independent exercise.
On reception to the woman with sight 3 200 ( . . has come it means, that sight of the woman was so bad, that it she only from 3 foots was capable to see that the person with normal sight saw from 200 foots. More in detail how the condition of sight enters the name, it is told in chapter head 5) which approved confirmed , that it she sees the greater big letter With (the greatest letter in verifying table is better. It is located on the top of the table) when looks at any point in several foots away from it her