Huvitz HPE-810 - 6.5.2. Near Vision Area Enlargement;Reduction

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6.5.2. Near Vision Area Enlargement/Reduction
Lens shape can be changed in four directions (Bottom - Near Vision Area, Top, Left, Right).
<Touch Interface>
To modify lens shape, make use of 4 touch points around
the lens shape.
Left or Right
Top or Bottom
Near Vision Area (Bottom)
Top
Left
Right