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Resources

September 2021 Resources

IOT Free-Form Insights Part 16

The sensation is an uncomfortable, unnatural feeling of unsteadiness for anyone who has experienced the “swim effect” when wearing and trying to adapt to progressive lenses. The wearer experiences a non-stable perception of surroundings. The swim effect causes discomfort and reduces overall lens satisfaction, making adaptation more difficult. Despite advancements in progressive lenses, some patients still experience this effect.
July 2021 Resources

IOT Free-Form Insights Part 15

There are many steps in an ophthalmic lens journey, and each can impact lens optical quality and performance. It starts with precise refraction by the doctor utilizing calibrated equipment: next step, precision measurements taken by the optician/technician using calibrated instruments. With the first two steps fulfilled, the lab’s free-form surfacing generators apply the free-form design to the uncut lens blank.
June 2021 Resources

IOT Free-Form Insights Part 14

There are many steps in an ophthalmic lens journey, and each can impact lens optical quality and performance. It starts with precise refraction by the doctor utilizing calibrated equipment: next step, precision measurements taken by the optician/technician using calibrated instruments. With the first two steps fulfilled, the lab’s free-form surfacing generators apply the free-form design to the uncut lens blank.
June 2021 Resources

IOT Free-Form Insights Part 13

Why compensate lenses? Free-form lens design and surfacing technology compensate the lens surface, making the effective power perceived by the patient in the primary gaze position match the prescribed power given by the refracting doctor. Why are they not the same? Short answer: The trial lenses used to refract the patient are flat and sit perpendicular to the patient’s visual axis in the primary gaze position, but when the lens is worn, it forms an oblique angle to the visual axis, inducing oblique aberration, changing the effective power perceived.

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September 2021

September 2021

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