[Pure alexia: presentation of a case].

INTRODUCTION AND CLINICAL CASE: A case of pure alexia, secondary to an occipital cerebral infarct, is presented, which initially appearing with bilateral amaurosis of two hours of duration, following by a significant difficulty to read, and according to patient, was a deficit to near vision and by criteria of ophthalmologists and optometrists was a presbyopia. Authors identified a lack of P-300 wave in study of endogenous component of events related potentials (ERP), to task of phonetic discrimination, and its normal registry to task of graphic discrimination.

CONCLUSION

Therefore, we confirm the cliniconeurophysiologic diagnosis of a pure alexia without agraphia, by means of this non-invasive method studying cerebral cognitive process.