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Plasma TVs do it to me also. It used to drive me nuts to go into a Best Buy and look at a wall of plasma TVs.

Looking up the retina displays, I see they are either IPS or OLED. The IPS likely has an LED backlight, and OLED is...LED. So a flicker is possible if they used PWM to limit the current to the LEDs.

Did you notice any change in the effect at different brightness levels?

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The only Apple device with an OLED screen is the iPhone X; the built-in displays on the 2012-2015 retina MacBook Pros as well as the ones made after the 2016 redesign are IPS with a 60hz refresh rate. There were issues with the graphics on the mid 2012 to early 2013 retina MacBook Pros - perhaps the parent got one of the defective models.

> The only Apple device with an OLED screen is the iPhone X

I think the iWatch also has an OLED panel.

All three of them do! I'm not sure how it slipped my mind. Thankfully, Cunningham's Law [1].

[1]https://meta.wikimedia.org/wiki/Cunningham%27s_Law

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