The base curves of eighteen rigid gas permeable lenses of various powers and manufactors mere measured after hydration-dehydration cycles. The Halsey Lenscope allowed measuring of the central as well as peripheral base curves. The general trend of the measurements, verified the hypothesized flattening of the central and steepening of the peripheral base curve with medium and high minus tenses. This observation might explain the clinical mystery of a measured flattened base curve accompanied by symptoms of a tight lens.
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