Blind accessibility in STEM fields is a growing process, but lack of tools with the high levels of precision and accuracy needed for upper level science classes, reluctance on the part of many instructors to teach students on level with their classmates due to the sheer amount of time it takes to make their powerpoints and other materials accessible, and frustration from students due to lack of those same materials, are just a few of the barriers that turn many blind students away from STEM fields.
I became blind 3 years ago. I have experienced the contrast in post-secondary science classes pre-blindness and post blindness, in the interactions with professors and students, tools needed to succeed, the importance of advocacy at individual and university levels, the issues caused when there is a lack of hands-on approach, and the need for more blind accessibility materials in STEM.