That’s a good point – others will no doubt measure your success by your absolute impact which will depend on your initial abilities/resources. My post was more meant to address the guilt and distress I suspect many disabled EAs feel, which I think is unfounded. 

Your disability does not make you less of an effective altruist

Effective altruism is about doing the most good with what you have. Having a mental or physical disability might cause you to have less time, money or energy to spend. But if you maximize the impact of these resources, you are doing as much good as you can with what you have.