The appropriate PH range for aphthalmic products is.. 6.0 to 8.0 The appropriate PH range for aphthalmic products is: A) 2.0 to 3.0 B) 4.0 to 6.0 C) 6.0 to 8.0*** D) 8.0 to 10.0. Share This: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook