In his Aparokṣānubhūti verse 81, Śaṅkarācārya says: sūkṣmatve sarvavastūnāṃ sthūlatvaṃ copanetrataḥ. Here, some modern interpreters have interpreted the word upanetra as referring to eye-glasses or some lens that enlarges the view. I am just wondering about the history of lenses and eye-glasses around the time of Śaṅkara. An allied question will be the date and authorship of Aparokṣānubhūti. Any information and references are appreciated.
Madhav M. Deshpande Professor Emeritus, Sanskrit and Linguistics University of Michigan, Ann Arbor, Michigan, USA Senior Fellow, Oxford Center for Hindu Studies Adjunct Professor, National Institute of Advanced Studies, Bangalore, India [Residence: Campbell, California, USA]
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