Most suitable Mac Book for no vision/blind user?

Considering you're only going to be using it for light tasks, I would either recommend the MacBook or MacBook Air. The MacBook is lighter, and thinner than the MacBook Air, and needs an adapter for regular USB devices, while the MacBook Air has USB ports, but is slightly thicker, and more powerful. The main reason I mentioned both is because the more powerful MacBook Air is a bit cheaper than the regular thinner MacBook, so at this point, it's up to you if you'd rather have a cheaper more powerful machine that's a little bit thicker, and heavier, or a more expensive machine that is a little less powerful, yet meets the requirements you listed and is the thinnest MacBook available.

I agree completely that the MacBook Pro--the only option not mentioned in the previous comment--will be overkill here. The Air is cheaper than the MacBook, but has 128GB of storage and 4GB ram to start with. The starting configuration for the MacBook is 256GB storage and 8GB ram, so you're getting a slightly thinner and lighter machine that offers more drive space and ram. It does have a less powerful processor, though, and a keyboard many people find to be uncomfortable. The keys on the MacBook, while larger, are hard to distinguish by feel; there's next to no space between them, so it can be harder to feel where each is. Not impossible, but if you go with the MacBook, be warned that there may be a longer period of adjustment for the keyboard.

I've repeated the last comment in saying the Air is heaver and thicker, but please don't misunderstand: that's like saying cherry pie is better than apple pie. Technically true, but both are still great pies and are quite similar. The Air is larger, yes, but not by much, and it's still a very, very portable and capable machine. In fact, the MacBook (the smaller computer) is only as powerful as a MacBook Air… From 2012, according to articles I read when it came out but which I can't find anywhere now.

The point is that both machines are extremely light and portable, have great battery life, and will do the basics well. The Air offers more power, more USB ports and a mini display port, and what many feel is a better keyboard, for less money. It starts with less storage and ram, though, and doesn't include the Retina screen that the 2015 MacBook does. Also, if you want SD card support, you'll need to drop an extra $100 on the 13-inch Air, which will be a bit larger. That's still less than the MacBook, though. The laptop section of my guide to Macs might help in your decision, but I'd also spend a long time at the Apple Store. Look at the different models, ask questions, and get a feel for them before you decide. While there, you can also ask if anyone is comfortable enough with VoiceOver to offer training, as that varies by store location.

Hello,

For now, stick with the 250GB hard drive. Save your money and when you find yourself running out of disk space, probably in a year, replace the 250GB internal drive with a 1TB SSD drive. The prices are dropping on SSDs. The pros are it will make your computer run faster and your battery life will improve a little bit. Skip the external drive as it will be slow and another thing you will need to carry around.

HTH and good luck.

No, you're right. Once you customize and purchase a mac, you can't upgrade anything. Older Macs you can, and nowadays in some of the Minis you can. The newer laptops, though, you really can't easily. Even if you can, doing so will void your warranty. I'd suggest getting the drive size you want now, rather than counting on putting a larger one in later. There are other options, like adapters that store mini SD cards flush with the Mac, offering extra storage at the expense of your SD slot. Still, if you can afford it, I see no reason to not get the drive size you want now.