I. SIMPLE MYOPIA: Simple refractive error, which is not associated with fundus changes; Optical correction/refractive surgery brings the patient to visual acuity=1. II. DEGENERATIVE MYOPIA: Refractive error which is associated with fundus changes (during the "fundus changes" progression, the visual acuity is getting worse); Myopic fundus changes-classification: A/ RETINA: Posterior staphyloma Chorioretinal atrophy. Optic disc changes = 1-3. Macula changes (Myopic maculopathy) = 1-7. Peripheral fundus changes = 1-6. B/ VITREOUS: Fundus examination should be performed on any myopic patient; Fundus fluorescein angiography allows the objective follow-up of the fundus lesions and also the evaluation of the treatment results; Optical correction/refractive surgery cannot bring the patient to visual acuity=1, due to fundus lesions; For some lesions--which can generate serious visual complications, it is necessary prophylactic treatment by ARGON laser photocoagulation or cryotherapy.