Buying guide

Choosing a Dive Computer If You're Color Blind

Color screens have made dive computers much easier to read for many divers. Warnings turn red or yellow, safe values show green, and different data fields get their own colors. For divers with color vision deficiency, that same design can be confusing, especially where red and green are the main way a screen says "fine" or "pay attention".

This guide looks at how color is used on dive computer displays, which design traits help divers who don't rely on color, and what to test before you buy. It's general buying advice, not medical advice; if you have questions about your vision and diving, talk to a doctor familiar with diving medicine.

How dive computers use color

On color-screen dive computers, color is used in a few consistent ways:

For divers with full color vision, this is helpful. For divers who confuse reds and greens, or who see some colors as similar shades, a value turning from green to red may look like almost no change at all if nothing else changes with it.

Why this matters more underwater

Water absorbs light unevenly, and reds fade first as you go deeper. That's why underwater photographers use strobes and filters. A screen is lit from behind, so it's less affected than the reef, but reflections, a tinted mask lens and dim conditions still change how colors look.

That means redundant cues aren't just a color vision deficiency issue. Every diver benefits from warnings that are obvious without color. The good news is that well-designed computers already work this way.

Display traits that help

Color vs monochrome screens for color-blind divers

A monochrome screen doesn't use hue at all, so every warning has to rely on text, symbols, inversion or flashing. Some divers with color vision deficiency find that refreshingly clear. Others find a well-designed color screen easier because of its brightness and contrast, even if some color cues don't help them.

Neither is automatically better. A color screen that pairs every color change with text and alerts can be excellent. A color screen that uses red and green as the only signal is the one to avoid. Our guide to color vs monochrome dive computers covers the general trade-offs.

Browse color-screen dive computers Browse monochrome dive computers

What to test before you buy

1. Download the manual and look at every warning screen. Note whether each warning includes text or a symbol, not just a color.
2. Check the alert options. Can you turn on sound, vibration or both? Can you adjust them?
3. Look for display themes. Some computers offer alternative color schemes or high-contrast options.
4. In store, ask for the simulator or demo mode. Many computers can simulate a dive. Watch what happens when values change.
5. Look through your own mask, especially if it has tinted or colored lenses.
6. Check the tank pressure display if you use air integration. How does it show low pressure?
7. Check menus: can you tell which option is selected without relying on color?

Customizing your setup

Once you've chosen a computer, a few settings can make it work better for you:

• Choose a color theme where the colors you see well are used for the most important data.
• Turn on audible and vibration alerts so warnings come through more than one sense.
• Increase brightness where the battery allows, so contrast is stronger.
• Arrange custom screens, where possible, so critical data sits in the same place every time. Position becomes a cue in itself.
• Note in your own words what each warning looks like on your screen, and keep it on a slate or card until it's second nature.

A small dive slate is a simple way to carry your own notes. Shop dive slates.

Masks and lenses

Some masks use tinted or colored lenses designed to reduce glare or adjust colors underwater. These can change how a computer screen looks, sometimes in unhelpful ways for divers with color vision deficiency. A clear, low-iron glass lens generally shows the screen most accurately. If you use a prescription mask, ask your supplier about lens options. Our guide to dive computers for prescription-lens mask users covers readability with corrective lenses.

Browse clear-lens dive masks Shop prescription dive masks

Talking to your buddy and instructor

There's no need to make a big deal of it, but telling your buddy and instructor that you have color vision deficiency can help. They can describe things by position or label rather than color, such as "the number on the right" instead of "the red number", and they'll understand if you ask them to show you a warning screen in practice.

The same applies to other color-coded dive equipment: some dive centers color-code cylinders, valves or markers, and some training materials rely on color in diagrams. Ask for labels or written descriptions where color is the only cue.

Other color-coded gear to think about

The dive computer isn't the only place color carries meaning. A few others worth checking:

• Analog gauges often have red zones on the dial. The needle position and printed numbers are your real reference.
• Nitrox cylinders and labels use color bands and stickers in many places. The written analysis label is what counts.
• Surface marker buoys come in different colors, which some regions use with specific meanings. Your local dive center can explain any conventions.
• Light signals during night dives are mostly about movement patterns, not color.