: Big screen dimensions or high DPI for vision impaired users? I'ld like to get my dad an ebook reader for Christmas. Yet, he is a bit vision impaired which means that he only has a good reading

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Size is more important than resolution for most visual impairments. As vision becomes more impaired, the ability to recognize detail is lost, and since text caries information in detail, larger sizes are used to compensate. Higher resolution adds detail, providing a better reading experience for those who can see it.

One exception to this advice is people who are loosing their field of vision, another is when using magnification.

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Getting older I started to have trouble reading, from my personal experience with a Sony PRS-700 (side lit), SONY PRS-T1 (no internal light) and Book Een Oddesey (front lit), I have to say that the lighting on the BookEen makes all of the differences being able to read comfortably. The BookEen also has a slightly higher resolution, at a similar screen size, but that doesn't seem to much of problem.

For prolonged reading, half and hour upwards at a time, a real bookreader is (again personal experience) more comfortable than computer screen or iPad or Samsung Galaxy. Although I have experimented with dimmed screens, they still give me the feeling of 'looking in the sun'.

I even prefer the BookEen over my more or less dedicated 3rd monitor (portrait mode, 1200x1920) that I use for reading on-line documentation.

For reading longer periods at a time, I definitely recommend using a properly lit dedicated ebook over a generic device.

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I would suggest going with an iPad with Retina Display not because:

Its a bigger screen
At the current time, better resolution than a few other devices

BUT because Apple requires their typeset to be adjustable and coded in to accommodate for visually impaired and not a fixed font size. So what this means is if your dad buys a book on iTunes, he tries to adjust the font size and fails, he can request a refund on the book and Apple will require the publisher to correct the issue to re-activate their content to be sold.

My experience with Amazon is across the board and is generally a "How many users have complained base" and their support is across the board. If he does have an issue with the book he can get a refund but the smaller device would be harder for your dad to read perhaps.

This may be an extension on your question but the quality of the content is as much important as the device you are getting.

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