PubMed · 9278788
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1997. Consultation section. Treating hyperopia.. https://pubmed.ncbi.nlm.nih.gov/9278788/
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BACKGROUND: As the slit-lamp technique is an restrictive method for the in-vivo examination and documentation of the multi-layer structure and the dynamics of the tear film and the cornea, e.g. during wound-healing processes, our aim was to find out whether it is possible to change the confocal laser scanning ophthalmoscope (CLSO; Zeiss) into a high-resolution confocal laser scanning microscope (CLSM) for the visualization of the anterior segments of the eye and the tear film by adapting a special objective system. In order to gain information concerning the function of such a cornea microscope we examined selected patients with erosion or pterygium before and after operation and subsequent phototherapeutic keratectomy (PTK), as well as some in-vitro corneal surfaces after photorefractive keratectomy (PRK). MATERIAL AND METHODS: We developed an objective adapter for the CLSO in order to focus the laser beam onto anterior segments of the eye to visualize the tear film and the layer structure of the cornea. By combining the long-distance objective or a contract objective with different zoom-optic lenses it was possible to alter the scan field size and so the magnification of the CLSM by a factor of up to 1000. RESULTS: The CLSM provides a new method for the in-vivo examination of the tear film and its dynamics as well as the thin layers of the cornea in real-time imaging technique with high contrast and resolution in non-contact or contact procedures. CONCLUSION: This system is a unique took for evaluating and monitoring the effect of excimer laser ablation after PTK and PRK on the corneal surface and the dynamics of the tear film. The application of this method causes no pain for the patient.
PURPOSE: To describe an efficient technique for suturing a Landers wide-field temporary keratoprosthesis for intraocular surgery in an eye with an opaque cornea. METHODS: Two sutures were preplaced at partial thickness into corneal stroma parallel to the corneoscleral limbus. Suture ends were placed through corresponding holes in the keratoprosthesis and tied. RESULTS: The temporary keratoprosthesis was held firmly in place with two sutures and provided clear visualization for extensive intraocular surgery. CONCLUSION: The preplaced two-suture technique for securing a temporary keratoprosthesis to the globe decreased the time that the globe was open.
PURPOSE: To determine whether the viscosity of eyedrops affects the distribution of the precorneal tear film. METHODS: Using a differential pachymetry map, we obtained tear film thickness in healthy volunteers before and after the instillation of nonviscous, aqueous artificial tears and a 0.3% sodium hyaluronate solution. RESULTS: The instillation of aqueous artificial tears disclosed a significant (P < .05) thickening of the superior corneal tear film compared with the inferior corneal tear film. The increase in thickness by 0.3% sodium hyaluronate solution was uniform, with no differences between the superior and inferior cornea. CONCLUSIONS: Aqueous artificial tears caused an uneven thickening of the precorneal tear film, with most of the thickening observed at the superior cornea. Lower sections of the cornea may benefit less from the instillation of nonviscous solutions.