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Cell Size and Scale - StumbleUpon. Some cells are visible to the unaided eye The smallest objects that the unaided human eye can see are about 0.1 mm long.

Cell Size and Scale - StumbleUpon

That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification. A magnifying glass can help you to see them more clearly, but they will still look tiny. Nucleus Medical Media: Medical Video, Animation &Illustration - StumbleUpon.