Soft hydrogel material and smart meter: what they have in common

1. Step 1. Soft hydrogel material — is material for — Contact lens. Silicone hydrogel that lets oxygen through.
2. Step 2. Contact lens — evolved from — Glasses. A lens right on the eye.
3. Step 3. Glasses — evolved into — Sunglasses. Glasses with dark lenses.
4. Step 4. Sunglasses — has part — Polarizing filter. Polarized glasses.
5. Step 5. Polarizing filter — is part of — Liquid-crystal display. Polarizers.
6. Step 6. Liquid-crystal display — is part of — Smart meter. A display.

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