An alternative form of 'astigmatic,' relating to or affected by astigmatism.
From astigmatic plus -al (adjectival suffix), creating a slightly more formal or archaic version of the same term. This form appears more frequently in older medical and optical texts.
The difference between 'astigmatic' and 'astigmatical' is like the difference between 'classic' and 'classical'—both mean the same thing, but 'astigmatical' sounds more like something from a 19th-century optometry textbook.
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