There are some frames which provide no, or only partial, peripheral support for the lenses. These are called rimless or semi rimless frames. These are constructed in several different ways. These frames consists of a shallow groove at the edge of lenses into which a nylon cord fits. Each end of nylon cord is attached to the frame. These frames are also called supra frames.
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Advantages: The chart is familiar Inexpensive, quick and easy to use and interpret Disadvantages: Snellen chart has only one 6/60 lette...
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Preferences: Similarly quantities of letters per line. Consistently separating amongst lines and letters. Uniform movement ...
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