Prism for Decentration; lens blank

This video explains how decentration is calculated and performed on lens blanks (also known as prism for decentration), and how the prism base direction is determined. This process should only be used on spherically designed front surfaces lenses, available in single vision and segmented; it cannot be used on any aspherically designed front surfaces.

[@danapekarchick906]

Failed my first attempt on my practical exam yesterday 8/20/2022. 80% questions were prism related. Wish I had of found your videos before today!!

[@MsTracyBennett]

Good luck on your next attempt! You got this!

[@maggiberaki5974]

Me too

[@LuizDomingues-mx7um]

Simplesmente sensacional, parabéns

[@MsTracyBennett]

Merci!

[@terrybennett2985]

Sound much better

[@MsTracyBennett]

MIC upgrade!! Well worth the $30! (Boya)

[@mariagcastaneda8811]

music is way too loud 😣

[@MsTracyBennett]

@@mariagcastaneda8811 I know. Not sure how to edit it after it’s posted.