Magnifiers for SMD soldering [closed]

I need some some Magnifier for SMD soldering so I bought these Magnifying glasses:

http://www.ebay.com/itm/381555608061?_trksid=p2060353.m2749.l2649&ssPageName=STRK:MEBIDX:IT

It is good for PCB inspection but it's not for SMD soldering: for 10x magnification glasses need to be only few centimeters away from PCB and for greater magnification, distance is of course smaller so it is not possible to use it for SMD soldering. My question is, is there any cheap solution? I'm not good at optics, but smaller magnification mean larger distance, right? What do you think about these glasses:

Here are specifications:

Color: Black

Material of Lens: Acrylic Lens

Battery: 3 * LR1130 Button Batteries (included)

Lens: 1.0X / 1.5X / 2.0X / 2.5X / 3.5X

Field of View:

1.0X: 250~350mm

1.5X: 200~300mm

2.0X: 175~275mm

2.5X: 150~250mm

3.5X: 80~120mm

Size of Lens(1pc): 85 * 8.5mm (L * T)

Item Size: 220 * 145 * 55mm / 8.66 * 5.7 * 2.16in (L * W * H)

Package Size: 22.0 * 17.7 * 4.7cm / 8.66 * 6.9 * 1.85in (L * W * H)

Package Weight: 270g / 9.5oz

What does "3.5X: 80~120mm" mean exactly?

closed as off-topic by uint128_t, helloworld922, PeterJ, Scott Seidman, Daniel GrilloMay 2 '16 at 12:24

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To get good magnification at a distance, you need optics with multiple lenses, essentially small telescopes attached to glasses. These are often used by dentists and surgeons. You can find these by searching for "loupe glasses". You'll see many for $200 and up and a few in the$20-\$60 range. Look for ones that specify the appropriate operating distance.