[Contact lens complications : Diagnosis and treatment]. / Kontaktlinsenkomplikationen : Diagnostik und Therapie.

Contact lens complications are all pathological alterations of the eyes caused by wearing contact lenses. Clinical manifestations particularly affect the cornea and conjunctiva. A differentiation is made between undesired manifestations and disease conditions that at least temporarily make the further wearing of contact lenses impossible. The decisive factor is that for every irritation of the anterior segment of the eye the possibility of contact lens complications is considered and investigated. This article describes the most important contact lens types, the physiology and pathology of corneal metabolism, clinical manifestations and the corresponding treatment.

Effect of the Illumination and the Types of the Lenses on Near Visual Acuity in Low Vison Patients

To obtain adequate information of illumination and lens types for visual acuity test of low vision patient, the relation between various illumination and vision was evaluated. Visual acuity for near and effective lens types were examined. Among the 28 patients (of 36 eyes), intensities of illumination were set at 200, 500, 1000 and 2000lux and the lenses of biconvex, aspheric and aplanatic were tested. The best visible range of illumination for the low vision patients was 500-1000lux, with lower power diopter for the same visual acuity and with aspherin and aplantic lenses. Results attained by our study may be applied for appropriate condition of illumiation and type of lens in the low vision care.