I’m not an expert but here’s a $1

Talk to your mum to see if both her parents or one has it. For this article and my basic understanding of dominant and recessive genes, if both her parents have it, that can possibly be two recessive genes. If it is recessive and your father doesn’t have it, you could just be a carrier of the gene or not have it at all.

It’s still possible that one of her parents have a dominant gene and the other has a recessive so it’s still not 100%. You can order tests, but research how accurate they are and reach out to your doctor to discuss your concerns.

Sorry to hear your news. I can answer basic questions if you have any (I'm not an expert).

Has your mom had her genes sequenced to see if they can determine the cause? You may be able to do the same. There are also clinical tests, like advanced eye exams, to test your vision including night vision and peripheral vision.

Depending on where you live, there are various organizations that can support you. For example, https://www.fightingblindness.org/ in the USA.

Go get your eyes looked at. You may or may not have it. If you do start learning living skills now and get I touch with you mr local blind community. You can have rich and full life with rp