Have you been wearing bifocal glasses for quite
Progressive lenses are often called 'no-line bifocals' because they first appeared as replacements for dated lined-bifocals. However, they actually offer much more than just an aesthetically pleasing change. Progressive glasses allow the wearer to actually have several points of vision - besides the standard distance and near vision needs (as offered in bifocal glasses). They are the truest of 'multifocal' glasses, as they offer more than just two visions (like bifocals), or even just three points of vision (like trifocals). Through the twist of the lenses, progressives allow your eyes to make the gradual change from near vision (reading), to computer vision, to distance vision; whereas bifocals call for an abrupt distinction between only near vision and distance vision.
While the immediate jump from bifocals or trifocals to progressive lenses may take a little while adjusting to, ultimately it's worth it. Because there isn't a distinct break from near to distance vision (of which your eyes may be used to when wearing other multifocal glasses), the tunneling of your vision in progressive lenses can cause a bit of confusion for your muscle memory at first. For instance, when you first wear progressive lenses, you might notice a slight blurring of your peripheral vision through the bottom of the lenses. This sensation will likely go away within a week or so, but is there because your eyes must get used to the gradual transition between the different vision distances. Of course if it does not go away, it would be best to contact your local optician again in order to determine the next plan of attack.
Ultimately however, if you've been using multifocal glasses for quite some time now and want something more, progressives are probably the best option for you. Progressive glasses can offer you a lot of advantages that unfortunately no other vision-correction utensil can give you at this time. So why not make the step today? Move on from your old bifocal glasses and ask your doctor about progressives today!
Hydraulic universal testing machines have very high accuracy requirements.
The hydraulic system is the power drive mechanism of the tensile testing machine.
The specific application of the electronic universal testing machine in the automobile manufacturing process: The electronic universal testing machine needs to be used for automobile parts.
Wave soldering refers to the molten solder (lead-tin alloy), sprayed by electric pump or electromagnetic pump into the solder wave required by the design, can also be formed by injecting nitrogen into the solder pool, so that it is pre-loaded The printed board of the component realizes the soft soldering of the mechanical and electrical connection between the solder end or the pin of the component and the pad of the printed board through the solder wave.
The frequency converter is a power control equipment that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's working power supply.
Electronic universal testing machine is a necessary equipment to control the quality of products.
The calibration operation of the electronic universal testing machine is still relatively unfamiliar to friends who use it for the first time.
Selective wave soldering defects and their prevention.
Testing machine, broadly speaking, is an instrument that verifies the quality or performance of a product or material according to the design requirements before it is put into use.
The tensile force is not an accurate value after being measured by the testing machine, and subsequent calculations are required to get the desired value.
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