Intrastromal Presbyopia Correction by Means of a Femtosecond Laser

Inclusion Criteria: * Age: at least 18 years old * Patients must have read, understood and signed the Patient Information * Patients are willing and able to return for follow-up examinations * Stable distance refraction * Manifested Refraction (see Table 1 for more details) : * Cylinder: -0.5 D to 0 D * Sphere: 0.25 D to 1.25 D * Spherical equivalent: Minimum 0.25 D * Best corrected distance visual acuity of the eye to be treated at least 0.8 * Subjects must have presbyopia as determined by an age-related need for optical aid (≥ +1.5 D) for reading with their best distance correction. Exclusion Criteria: * Minimum cornea thickness \< 500 µm * Ocular dominance (only non-dominant eyes should be included) * Uncorrected Near Visual Acuity of 0.5 or better * Difference between manifested and cycloplegic refraction of \> 0.75 D in spherical equivalent * Median K values \< 40 D or \> 46 D * Topographical astigmatism \> 5 D * Abnormal corneal topography * Patients with previous corneal operations on the eye to be treated (e.g. LASIK, PRK, X-Linking; this does not include cataract operations) * Scarring or opacity of the cornea * Transplanted cornea * Connective tissue weaknesses * Keratectasia and other diseases of the cornea * Patients with wound-healing disorders such as connective tissue disease, autoimmune illnesses, immunodeficiency illnesses, ocular herpes zoster or simplex, endocrine diseases, lupus, rheumatoid arthritis * Patients regularly taking medicines that could influence the result of the treatment * Glaucoma or a risk of glaucoma * Patients with concentration disorders, epilepsy, diabetes mellitus and other complicating diseases * Patients with disorders of the ocular muscle, such as nystagmus or strabismus * Sensitivities to the drugs used in this study * Continual wearing of contact lenses before the pre-examination and before the operation. Patients must refrain from wearing contact lenses for at least 14 days prior to these dates * Patients who are pregnant or are lactating * Patients who are participating in another ophthalmological clinical study * Best corrected distance visual acuity of the second, not to be treated eye is 0.5 or less.