click: 
 
KERARING MODELS:
https://mediphacos.com/pdf/cornea/keraring/catalogo/en/Keraring_REV08_EN_web.pdf
NOMOGRAM:
http://keraring.online/
MEDIPHACOS - OFICIAL SITE:
https://mediphacos.com
CONTACT:
Av. Cristovam Chiaradia, 777 - Buritis
Belo Horizonte - MG - Brasil - 30575 815
Brazil: 0800 727 2211
International: +55 31 2102 2211
+55 31 99290 1166 (WhatsApp)
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