<P> Robert Grosseteste 's treatise De iride ( `` On the Rainbow '' ) , written between 1220 and 1235 , mentions using optics to `` read the smallest letters at incredible distances '' . A few years later in 1262 , Roger Bacon is also known to have written on the magnifying properties of lenses . The development of the first eyeglasses took place in Northern Italy in the second half of the 13th century . </P>
<P> Robert Grosseteste 's treatise De iride ( `` On the Rainbow '' ) , written between 1220 and 1235 , mentions using optics to `` read the smallest letters at incredible distances '' . A few years later in 1262 , Roger Bacon is also known to have written on the magnifying properties of lenses . The development of the first eyeglasses took place in Northern Italy in the second half of the 13th century . </P>
when were the first pair of eyeglasses made
when were the first pair of eyeglasses made
13th century
13th century