{"id":21431,"date":"2025-11-26T00:56:57","date_gmt":"2025-11-26T08:56:57","guid":{"rendered":"https:\/\/www.oculus.de\/us\/?post_type=avada_faq&#038;p=21431"},"modified":"2025-11-26T04:58:23","modified_gmt":"2025-11-26T12:58:23","slug":"in-which-slot-should-the-reference-lens-be-when-measuring-vd","status":"publish","type":"avada_faq","link":"https:\/\/www.oculus.de\/us\/faq-items\/in-which-slot-should-the-reference-lens-be-when-measuring-vd\/","title":{"rendered":"In which slot should the reference lens be when measuring VD?"},"content":{"rendered":"<p>DIN EN ISO 1366 defines VD as follows: absolute value of the distance between the rear surface of the spectacle lens and the corneal apex measured along the line of sight, i.e. orthogonally to the plane of the rim.<br \/>\nThe measurement should be taken with the reference lens in the first slot of the rear lens holder (next to the trial frame body).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>DIN EN ISO 1366 defines VD as follows: absolute value of the distance between the rear surface of the spectacle lens and the corneal apex measured along the line of sight, i.e. orthogonally to the plane of the rim. 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