4. Optics: eye examining, vision testing and correcting
  5. Eye examining or testing instrument
  6. Subjective type
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Field of vision collimator

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent

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Field tester

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent

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Field testing using spread spectrum technique

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Reexamination Certificate

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Fixation device for eye testing

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent

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Fixation sight apparatus for ophthalmologic instrument

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent

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Flash recovery timer and warning device

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Reexamination Certificate

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Flash recovery timer and warning device, with recorder

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Reexamination Certificate

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Flash recovery timer and warning device, with recorder

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Reexamination Certificate

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Flicker and frequency doubling in virtual reality

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Reexamination Certificate

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Four-channel anomaloscope

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent

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Fundus camera

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent

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