That's a side effect of the dry eye (which resolved for me 3 months in despite increasing the dose).
If it helps put people at ease, consider how many folks have used Accutane over the last 50 years. Search for clinical evidence of "permanent damage to vision". It's not there, but I realize even temporary sides can be scary. Even the "liver damage" that everyone's on high alert for doesn't seem to exist as a serious threat, but if
someone got previously undiagnosed severe liver disease it isn't a good idea to use it of course.
As best as I can determine, the only "permanent" negative effects with real potential (and rare even then) appear to be for those who already have dry skin ending up with even dryer skin. Since oil overproduction is almost always present with acne this is a welcome change for most(getting to "normal" skin). And of course, the truly horrific birth defects if taken while pregnant, since it completely screws up embryo development (but this risk is temporary, and no longer a risk once treatment is over).