By Ronald K. Watanabe OD FAAO
This scientific instruction manual offers universal touch lens issues of step by step therapy strategies. 40 case reviews disguise more than a few difficulties from uncomplicated becoming dilemmas to adversarial results of touch lens put on. every one case starts off with a presentation of indicators and indicators, together with a case background and target try out findings and ends with the author's analysis and dialogue.
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Extra info for Clinical Cases in Contact Lenses
Boston Original Cleaner was formulated with abrasive particles to remove hard protein deposits from silicone 64 Clinical Cases in Contact Lenses acrylate RGP materials. 1–4 The most effective way to prevent these lens parameter changes is patient education on proper daily cleaning technique. 1–5 The patient should also concentrate on cleaning the lens edges. In doing so, the central portion will be cleaned too. To clean the concave surface, rub the lens in a radial fashion. 1–5 Care system selection is important for RGP wearers.
1–4 Because it is very difficult to accurately verify the soft toric lens cylinder axis in office, other 32 Clinical Cases in Contact Lenses possible causes of axis inaccuracy must be ruled out. Rotation can be assessed in the slit lamp by several methods: reticule with protractor, slit beam rotation (on slit lamps with rotational markings), or estimation using lens markings or clock hours. The first two methods are more accurate, although an experienced observer can accurately determine rotation by estimation.
Because the lens rides superiorly in a lid attachment position, the optic zone is shifted upward. This brings the inferior edge of the optic zone toward the pupil, which makes the flare even more noticeable. Therefore, it is helpful, in this case, to improve lens centration to further decrease the flare. 1–5 Since we already increased the optic zone diameter, it makes sense to also increase the lens diameter by the same amount. 4 mm increase in both diameters is sufficient. This change improves centration by covering more of the cornea and also by steepening the fit.
Clinical Cases in Contact Lenses by Ronald K. Watanabe OD FAAO