[Difficulties in reading the optotype].

The paper presents in its first part the actual knowledge about the literal paralexias taking into consideration that the main method to examine the visual acuity includes the literal gnosia that has a symbolic character. The literal paralexias represents a normal cerebral phenomenon at the limit of the visual acuity. The typology of the paralexias is being studied by the morphological entiry of the letter and by the degree of being aware of them. After these methods we can divide the subjects in 3 types. We conclude the utility of the construction of some charts containing letters at which we should take into consideration the degree of the morphological entiry of the letters as well as the suggestion of creating charts containing letters could be left out letters with double similitude: morphological and semiotic.