When opticians have to measure how much refracting power of lenses that a person needs in order to correct his or her vision, they usually use optical lens trial frames in which they insert various lenses and then test the vision of the subject through a series of specialized vision tests. These frames are made to be easily adjustable in many ways. They are frequent in most of the optical offices around the world.
The TF-A is a five-piece package of high-quality, durable lens trial frames, which provide high adjustability for a few categories relevant to the optician when measuring. This way, the optician can not only measure the refracting power required, but also see at which angle the cylinder should be on the lenses.
All of the frames have an adjustable PD range, which comes in up to 10 specifications: 52mm, 54mm, 56mm, 58mm, 60mm, 62mm, 64mm, 66mm, 68mm, 70mm. We enable our customers to choose five specifications that are to be delivered, with the default specifications being 58 to 66mm.
The frame also provides the possibility of rotating the lenses inside, around the optical axis, for full 360°.
PD Adjustable Range (10 Specifications): 52 mm, 54 mm, 56 mm, 58 mm, 60 mm, 62 mm, 64 mm, 66 mm, 68 mm, 70 mm
Axial Calibration On Each Disc: 165° ~ 0 ° ~ 180 ° ~ 25 °, axis graduation line runs counter clockwise along axis graduation line of lens frame, and the interval of graduation line is 5 °
Degree That Front Lens Rotate Around Optic Axis inside Lens Frame: 360 °
Range of Left or Right Lens Frame Leg Length Adjustment: 90 ~ 99 mm, Length of specification of trial frame increases 1 mm in turn
Dimensions: 270 x 185 x 50 mm
Weights: 0.1 kg
You can choose 5 specifications freely. The 5 default ones are: 58 mm, 60 mm, 62 mm, 64 mm, 66 mm. If you don't want the default specifications, please leave us a message about your choice.
|Processing time||2~4 business days|
|Shipping time||3~7 business days(Fedex International Economy or DHL)|