Dioptri

Dioptri adalah satuan pengukuran kemampuan optikal dari sebuah lensa, cermin cekung atau cermin cembung. Dioptri dirumuskan sebagai resiprokal jarak fokus yang diukur dalam satuan meter (yakni 1/meter). Sebagai contoh, lensa 3 dioptri memiliki panjang sinar paralel terhadap fokus ⅓ meter. Istilah ini diusulkan oleh Ferdinand Monoyer dari Prancis tahun 1872.[1][2][3]

Salah satu keuntungan mengukur kekuatan lensa menggunakan kekuatan optik dibanding jarak fokusnya adalah, saat lensa yang tipis diletakkan berdekatan, kekuatannya akan meningkat. Artinya jika ada lensa 2 dioptri diletakkan bersebelahan dengan lensa 0,5 dioptri, akan menghasilkan kekuatan optik yang sama dengan lensa 2,5 dioptri.

Referensi

  1. ^ Monoyer, F. (1872). "Sur l'introduction du système métrique dans le numérotage des verres de lunettes et sur le choix d'une unité de réfraction". Annales d'Oculistiques. Paris. 68: 101.  The term had been coined by Johannes Kepler and was used for the title of his book Dioptrice, in which he laid out some fundamental concepts on geometric optics.
  2. ^ "Monoyer, Ferdinand". La médecine à Nancy depuis 1872. Diakses tanggal 2011-04-26. 
  3. ^ Colenbrander, August. "Measuring Vision and Vision Loss" (PDF). Smith-Kettlewell Institute. Diarsipkan dari versi asli (PDF) tanggal 2014-12-04. Diakses tanggal 2009-07-10. 

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