Donegan DA-5 OptiVisor Headband Magnifier, 2.5x Magnification, 8" Focal Length

Donegan vs. MagnifyLabs vs. Bausch & Lomb:The main decent quality choices seemed to be: Donegan Optivisor DA ($36 - glass lens - this review) or LX ($26 - acrylic lens), MagnifyLabs Headband Magnifier ($26 - glass lens) and less-known knock-offs, and Bausch & Lomb Magna Visor ($36 - acrylic lens). The Bausch & Lomb had too many bad reviews. The MagnifyLabs apparently has glass lenses like the Donegan DA and is cheaper and well-reviewed. But for only $10 more I preferred to go with the proven original - the Donegan DA. The headband has a huge adjustment range to accommodate a-n-y head size and is remarkably comfortable due to the padded forehead. The plastic adjusting size and flip-up tension knobs are hokey but they work.DA vs. LX / ALRegardless of misinformation by others, the Optivisor "DA" models have the two-piece glass-lens-in-blue-tinted-plastic-frame lens plates, while the cheaper Optivisor LX (= AL lens) models have the single-piece-all-clear-molded-in-acrylic-lens-plate. No idea why Donegan chose to confuse things by using Optivisor "LX" for the headband but "AL" for the lenses. My box said "DA-5" and I scratch-tested the lens - it's glass.Prescription Glasses:You can wear your glasses with this - plenty of room - or no, as the lens acts like near-sight glasses anyway. I prefer to wear my normal prescription glasses with these since they correct both my eyes for crystal clear starting vision, with two interesting side effects: 1) the overall magnification is noticeably greater due to the magnification added by my glasses (great!); and 2) the focused working distance is reduced - for me for the 2.5x lens from the nominal 8" to 5-6". So if you wear glasses, consider this in your lens power choice, as your glasses will add more magnification themselves, plus reduce your working distance further than the nominal number claimed.Lens choice:For me, the 2.5x magnification lens (5 diopter) is perfect for general usage inspecting things like splinters, coins, golf club grooves, electronics, bugs, super-glueing very small stuff, etc., because it shows everything of possible interest while still allowing a comfortable 6-8" distance from the work and a reasonably broad and deep field of view. This is as opposed to, say, the highest 3x magnification (10 diopter) which makes you work excruciatingly close at 4" (or 3" with glasses) and also with a narrower field and depth of view. With a 3x lens at 4" you can't even get your fingers in there to do anything - only for specific professional use. So I think most would find opting for a comfortable working distance more important than trading that off for any extra magnification. A modern car key is about 4" long so try it - put a newspaper down and bend down until your glasses meet the car key and try to do anything in front of the lens. Plus you can just add a $10 OptiLoupe (see below) to a medium magnification lens for the rare times you want to scrunch down to 2" to check out something further at 4-5x.OptiLoupe LP-1 ($10):I added the separate 2.5x OptiLoupe for the occasional super-close-up. The loupe mounts on either side you prefer - just pull the original lens mounting screw or pin out on that side and shove the OptiLoupe on with its longer screw in its place. The loupe lens was maybe glass at one time but it definitely is acrylic now (I scratch-tested it), but that seems irrelevant given the perfect clarity. You have to close the other eye when using the loupe, but that works fine. (You can't use one for each eye because your eyes won't focus properly through both together.) Assuming you'll rarely need/use a super-close-up, this is a much better solution than having to switch a separate high power lens plate in and out of the headband. With my glasses on and this flipped down, the working distance is reduced to 2" but the clarity is great.Quasar LS (Lighting System) model 6010 ($25) - not DoneganYou can see things with normal room lighting, but for serious views, actual detailed work, or long use, the more magnification, the more light required. The Quasar is very convenient - very bright lighting comes with you and I haven't felt the need to add external light. To add it on, you pull the two original lens mounting plate screws out, slap the Quasar LED frame on the front of the lens plate, and stick both back on with the longer plastic pins supplied. Then you just place the battery pack on the side of the headband and strap it on with the supplied velcro strap. Simple on-off switch on the side of the battery pack. Unnoticeable when mounted. Takes 2 AA batteries that come with it (nice surprise - Energizer alkalines!). Batteries claim 100+ hours of life, which given LEDs, seems likely. Fyi, works with the MagnifyLabs headband also. Donegan offers the VisorLIGHT, a single non-LED bulb alternative but it seems pretty lame in comparison given 5 hour battery life, $10 replacement Xenon bulbs, and review quality issues.Additional/Replacement Lens Plates:This is extremely confusing because of the supplier misinformation as of June 2016. So I talked with the manufacturer Donegan. They confirmed they do offer both glass and acrylic additional/replacement lens plates through their dealers (although, oddly, you can't find these on their manufacturer website). They confirmed their glass lenses are two-piece, with the lenses glued into a blue-tinted surrounding acrylic frame and designated LP-2/3/4/5 with "LP" standing for Lens Plate. Their acrylic lenses are a single-piece of clear acrylic, with the lenses molded directly into and as p[art of the overall acrylic frame and designated AL-2/3/4/5 with "AL" standing for Acrylic Lens. So glass lenses have a blue-tinted frame and acrylic lenses have a clear frame. Confusingly, all the "LP" lens plates currently listed on Amazon indicate in their details that they are acrylic, not glass, which conflicts with the "LP" designation. Counter-confusingly, the pictures show blue-tinted frames which would indicate glass lenses. So either they are glass and the "acrylic" in the detail description is wrong, or they are acrylic and the LP and picture are wrong. So check what you get accordingly - maybe they'll correct this corrected after our talk.Optical Power (Diopter) vs. Magnification Power:I did a little research to figure out what the Optical Power ("Diopter") vs. Magnification Power thing is all about. Turns out Optical Power ("Diopter") is the fundamental measurement optical professionals use because it integrates naturally with the compound optical equations typically required in their profession. Technically, the Optical Power (Diopter) of a lens equals the reciprocal of its Focal Length measured in meters. So, for example, a lens with a 20 centimeter focal length (1/5th of a meter) has a Diopter of 1 / [1/5] = 5, and a lens with a 10 cm focal length (1/10th of a meter) has a Diopter of 1 / [1/10] = 10. "Magnification Power" = the increased size of the image viewed, not the Focal Length, so it is not a one-to-one linear relationship, but is generally related to Diopter as follows: Magnification = [Diopter / 4] + 1. So, for example, a 5 Diopter lens has a Magnification Power of: [5/4] + 1 = 2.25x while a 10 Diopter lens = [10/4] + 1 = 3.5x magnification. Usefully, you can add Optical Powers (Diopters) to understand the Magnification result, but not Magnification Powers. So adding a 5 Diopter OptiLoupe (2.5x) to my 5 Diopter headband (2.5x) = 10 Diopters => which converting = [10/4] + 1 = 3.5x overall magnification ... similar to the maximum 10 diopter 3.5x lens plate option.

I had to sort through a lot of reviews for similar products that were cheaper in price, and questionable in quality, before settling on this Optivisor unit. I knew from the start that I wanted to have a setup that has a light, but definitely did not want a silly USB rechargeable light that has a fixed battery that is not replaceable. I wanted something with an aimable light kit that takes standard double a or triple a batteries.This one has a very adjustable and secure headband, that has a pad in the forehead area, and a very good tension adjustment nut with excellent click detents for holding its setting. I have a similar antique item that belonged to my grandfather, that is all metal with a sliding adjustable hoop that goes around your head and a flip up lens assembly. The Optivisor appears to be the closest modern equivalent and I have been delighted with it. The visor assembly does pivot up and down and stays in place nicely, but more importantly, you can get a third party LED light kit made by Quasar, which is a truly excellent addition. Because the light kit places LEDs around the periphery of both lenses, it stays permanently aimed at whatever you are looking at. I highly recommend a complete kit that includes this Optivisor, the Quasar LED light kit, and the accessory pivoting loupe lens.There is a minor difficulty you have to watch out for when you install the accessory lens along with the Quasar LED light kit. Do not fully install the light kit with the one-way push pins until you attach the lens. You also want to know which eye is your dominant eye, and be sure to install the lens on that side. See my review for the lens kit about how to know which is your dominant eye. The screw shaft that comes on the lens is not long enough to pass through and accommodate the thickness of the LED bezel. The Quasar light kit comes with a longer screw and you have to disassemble the lens assembly, with its spring and tension nut, in order to install the longer screw. The screw on the lens replaces one of the four plastic push pins and be sure to adjust the spring tension nut first for proper pivoting friction, before you install and tighten the nut on the inside of the visor. If you've got it right, the lens easily pivots in or out of your line of vision and stays in place without being jammed up.There is a pivoting monocular lens assembly that is available as an option for this visor. One of the things that I wanted was the opportunity for more magnification that some of the cheaper units seemed to offer. Well this is a solution as an accessory that addresses all my needs. You have to accept the fact that when you use the accessory lens, you temporarily give up the binocular vision and just concentrate on what you see with your dominant eye. It works quite well.The illuminated binocular / stereo magnified vision that this visor and light kit provide are excellent for doing fine work with small tools, surface mount electronics work, pulling splinters, plucking reversed eyelashes etc etc. The total kit with accessories costs much more than the cheap stuff but really delivers. Sometimes life is too short for cheap junk. I really appreciate the quality and utility of this kit, and I expect it will last a long time.

This optivisor is a great improvement over what I had been using (for decades). The adjustable headband stays where you put it, the knobs for adjusting the friction to hold the visor up or down actually work very well. Overall, very satisfied with this product. I also think you can purchase additional magnifying lenses but haven't really dug into that yet.

This is a good quality, comfortable head-worn vision magnifier at a very good price. It is easy to adjust to head size and is comfortable to wear while working. The price was significantly lower than most other advertised retailers. Delivery was safe and on-time.

The lens quality is very good - it's not apparent from the picture, but the lenses are glass, retained by a plastic plate. There are several diopter choices available when you order this - I had to get a higher magnification because of my vision, and that forces me to be closer to what I am looking at, but it works well for me. Choose magnification carefully, based on your needs.it's easy to look under the visor for normal vision if you have it adjusted properly.The head strap is adjustable in both tightness and resistance of the visor from dropping down, but the quality is not as good as I would like. I can't get a really tight fit as the ratcheting plastic headband mechanism releases if it's too tight. That's why I didn't give it 5 stars. I would have paid more for a better strap, if I could find one.Despite the issue with the head strap, the magnifier is very usable, and has helped me a lot with building circuit boards, which is why I purchased it.