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When I try to boot my Mac in recovery mode by holding alt+R, the progress bar shows up as if it is loading the disk. However, when it finishes loading, it switches to a screen that has horizontal lines across it, which resemble white noise on a television. You can vaguely make out the Apple logo with small cross sections of it in the horizontal strips.

It eventually switches to another screen where you can make out the image of the recovery mode options, but, again, with the screen broken up into small horizontal strips with pieces of the image, but not lining up vertically. I can move the mouse around, so the computer isn't just completely frozen, but I can't interact with anything.

Is my recovery disk corrupted? How can I fix this issue?

My Mac is on macOS Sierra Version 10.12.6.

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If you suspect that your recovery partition has corrupted data, you can use Internet Recovery (hold OptionCommandR or ShiftOptionCommandR, which will download the Recovery partition from Apple servers and see if you have same issues. See: HT201314.

However, I think that it is more likely that your Mac has a problem with the video chip, RAM or screen. I suggest you boot your Mac in Diagnostic mode (hold D or OptionD at startup) and run the battery of tests which may reveal a hardware problem, if it exists. See: HT201257

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