Trial Frame

Abstract

The invention relates to a trial frame for determining the subjective refraction of a subject, comprising two lens holder devices for receiving insert lenses, a bridge, which connects the lens holder devices in such a manner that their distance relative to each other is adjustable, a nose rest device having a pivotable and height-adjustable nose rest and two temples, which are adjustable in length and height, the nose rest device having an adjustment gear for adjusting the height of the nose rest, the adjustment gear having a toothed rack and a bevel worm wheel, which are engaged with each other.

Description

technical field [0001] The invention relates to a trial frame for determining subjective refraction of a subject comprising two lens holder devices for receiving an inserted lens in such a manner that their distance relative to each other is adjustable Connected nose bridge, nose pad device with pivotable and height-adjustable nose pads, and two temples adjustable in length and height, nose pad device with an adjustment gear mechanism for adjusting the height of the nose pads . Background technique [0002] Such trial frames are typically used for testing ophthalmic lenses. To do this, the trial frame is adapted to the subject, ie the person, and an easily replaceable insert lens or trial lens is inserted into the trial frame. The insert lenses are arranged in a rotatable manner so as to be able to correct astigmatic defects along their axial position. The lateral and height defects corrected by the prism must also be adjustable, which is why the trial frame must be preci...

AI Technical Summary

Problems solved by technology

These necessary manufacturing steps are also relatively time-consuming

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