What causes a snake's eyes to appear cloudy or bluish just prior to skin shedding (ecdysis)?

Answer

The layer of skin covering the eye, called the spectacle, separates from the underlying skin.

Before shedding, the eyes become cloudy or bluish because the spectacle, the transparent layer of skin covering the eye, separates from the skin layer beneath it.

What causes a snake's eyes to appear cloudy or bluish just prior to skin shedding (ecdysis)?

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