4. Optics: eye examining, vision testing and correcting
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  6. Folding
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Tachistoscopic focus control

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
Patent

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Target image projector

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
Patent

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Test disk for eye examination

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
Patent

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Trial lens eyeglass clip

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
Patent

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