Safety Goggles do not have presciption lens because of the distance from the eye lens.   Many companies make safety gogles that fit over presciption glasses.   The presciption glasses should be made of impact resistant lens and frames that are worn under the goggles.   There are tree types of safety goggles;  vented,semi-vented and non-vented.   Requirements of which type of safety goggle to be used is generally spelled out in most MSDS's, the new SDS's or by OSHA regulation.    The vented are less likely to fog but offer the least safety.   THe non-vented will definitely fog up over time but they make an anti-fogging solutions which can be applied to the goggle lens to reduce the fogging and lenghten the where time of the goggles.    One other note is continued use and long term use of non-vented goggles is not good for your eyes.   The lack of ventilation can and may cause damage to your eyeballs.   If long term use of protect is needed for the work you do,  I suggest the use of a full face respiration with inserts, full-face supplied air system with inserts, or a PAPR with safey glasses under the hood or face-shield.   

Billy Sabato

From: "Aniello Tambasco" <aniello.tambasco**At_Symbol_Here**WILKES.EDU>
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
Sent: Wednesday, May 16, 2012 12:12:41 PM
Subject: Re: [DCHAS-L] Prescription chemical splash goggles