His eyes are tired and lacking in sleep, but they have absorbed a flood of changes over the course of 40 years.

Now his eyes lacked all trace of that emotion.

Her eyes, when they met his, lacked the warmth that the sunlight should have given them.

His eyes lack eyelids and are often subjected to the abuse of various weather conditions.

But on the trail, Emma's smile was absent and her eyes lacked any luster at all.

Because of that, the eye lacks a single point of focus.

His eyes lacked focus, he was definitely running a stimulant program.

She did not seem in pain, but her eyes lacked focus and that clued me.

Those blue eyes were directly on me, totally lacking the softness his voice held.

The vital ingredient which the nautilus's eye lacks is a lens.