I remember listening to a Hadley Institute podcast on low vision crocheting a while back so I checked their website, but couldn't find it (I will keep looking!) BUT, I did see that they are hosting an online crafting meeting on June 12 @ 1 to discuss all things creative and I bet someone would be able to answer crocheting questions!
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Hadley Institute offers free education to anyone with visual impairments, including their families and caregivers! They are an awesome resource for low vision!