Just to give you an idea of what already exists so you don't waste time on already existing marketed items:


The distance scanner already exists both with sound and vibration, there was already made a cane as well relying on this tech using two laser points and another one with sonar sound distance measuring. Apps for recognising colors, objects, items, numbers, text etc with AI and apps for communication that helps people with eyesight helping blind people also exists (Be My Eyes) free and available for everyone on this planet with millions of users ready to help the blind.
There also already exists screen readers for using computers on both phone IOS and computers (ZoomText, VoiceOver etc). Wearable glasses that read text out loud also exists already. Heat detectors for mounting on drinking cups to allow blind people to pour boiling water into a teacup without getting hurt also exists.
Most things you can think of already exists so you could find something that merges some of these things above into one functional unit to make a difference. Tons of equipment for sports like skiing, playing ball (football etc) also exists.

I'm thinking there may be something out there, but I wish we had a good landmark device. For instance, I get to a party and when I sit at a table I can activate the device. Then when I go get my food, go to the restroom, go dance, or talk with friends in the party I can find my table afterwards.

I have an idea. I use a smart home device like many blind people do these days. It would be nice to have something to hook it up to track items or pets. For instance if I wanted to find my cat I'd ask Alexa and the collar my cat wears give off a audible sound. Or if I want to find my remote for something I ask Alexa wheres remote and again sound is used for me to locate. That would be hugely be appresiated. I'm not sure how youd achieve it.

Another idea which is a bit more grand and a lot more challenging is a helper robot that can help read, scans the area for hazards, smart enough to converse through alexa. And if you can solve hurdles possibly assist outside with basic guide work.

Another idea may be worth considering is a better more intelligent and interactive smart home device. Theres room for major improvements. The right dedication and team could easily surpass google and amazon on smart home technology.

A way for us to follow a conductor in a band

Full screen Braille displays

Personally I really want a robot helper assistant. Like c3po r2d2 or bb8. Where they perform a mix bag of tasks for me. This would be amazing.

This one is hardly within your ability to realize as a student (both in terms of skills and money) but I can't wait for the day where we finally get decent AI on our phones. Like, I have Siri and I can ask her simple questions like "what's the weather like outside" or "what are my appointments" but she isn't able to provide me with any detailed and comprehensive information. For example if I ask her a complex question, she will simply make a web search and list a few pages for me. That's pointless because I don't know how to use voiceover, so I can't access those pages on my phone. It would be cool if Siri would simply provide me concise information about my subject based on those web pages. Heck, it would already be neat if she could read to me an entire wikipedia article, which is currently not possible. Also, it would be cool if the conversations between cell phone user and AI could turn more into actual conversations rather than simple answers followed by simple responses. This may all sound like sci-fi but I once heard that the technology actually already exists for many of these things. The reason Google didn't put them on their phones is because they've been neglecting the AI area for the past few years for the sake of other things (camera improvement etc). This is quite unfortunate. Siri has barely improved during the past 6-7 years. I have an iPhone 5s, my wife has an iPhone X, our Siris are almost the same.