Christiaan Huygens' Telescope Lenses Tell Us He Was Nearsighted - by ScottyJ_PhD
How do we know Huygens was nearsighted? We don’t for sure: diagnosing medical conditions in historical figures is tricky business, and claiming to do so with certainty is pretty much malpractice in two professions – medicine and history. So Pietrow rightfully hedges his prescription with the appropriate degree of uncertainty.
This was an important advantage, because the best telescopes of the period were reaching unwieldy lengths, some reaching over 50 meters from end to end. When light passes through a lens that is thicker in the middle and thinner on the edges, the light is bent, but different wavelengths are bent at different angles. Short wavelengths, like those that produce the color blue, will converge more quickly than longer reddish wavelengths, leaving an annoying colorful tinge surrounding whatever object you’re looking at through the telescope., Bishalsonar47.
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