---
product_id: 2308154
title: "Donegan DA-4 OptiVISOR Headband Magnifier, 2X Magnification Glass Lens Plate, 10\" Focal Length"
brand: "donegan optical"
price: "¥17383"
currency: JPY
in_stock: true
reviews_count: 3
category: "Donegan Optical"
url: https://www.desertcart.jp/products/2308154-donegan-da-4-optivisor-headband-magnifier-2x-magnification-glass-lens
store_origin: JP
region: Japan
---

# 10" precise focal length 2X magnification power Adjustable headband fit Donegan DA-4 OptiVISOR Headband Magnifier, 2X Magnification Glass Lens Plate, 10" Focal Length

**Brand:** donegan optical
**Price:** ¥17383
**Availability:** ✅ In Stock

## Summary

> 🔎 Elevate your detail game—see more, do more, be more.

## Quick Answers

- **What is this?** Donegan DA-4 OptiVISOR Headband Magnifier, 2X Magnification Glass Lens Plate, 10" Focal Length by donegan optical
- **How much does it cost?** ¥17383 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/2308154-donegan-da-4-optivisor-headband-magnifier-2x-magnification-glass-lens)

## Best For

- donegan optical enthusiasts

## Why This Product

- Trusted donegan optical brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Seamless Workflow:** Flip-up visor design lets you switch between magnified and normal vision instantly.
- • **Custom Comfort Fit:** Adjustable headband with padded leather ensures all-day wearability—even over glasses.
- • **Versatile Use Cases:** Perfect for jewelry, electronics, crafts, and intricate inspections—join the elite pros who trust OptiVISOR.
- • **Crystal-Clear Optics:** Ground & polished prismatic glass lenses reduce eye strain and sharpen focus for professional-grade clarity.
- • **Hands-Free Precision:** Snap-in 2X glass lens lets you focus on the details without lifting a finger.

## Overview

The Donegan DA-4 OptiVISOR is a premium headband magnifier featuring a 2X ground glass prismatic lens with a 10" focal length, designed for hands-free, precision work. Its adjustable, padded headband fits comfortably over glasses, while the flip-up visor allows quick transitions between magnified and normal views. Ideal for professionals and hobbyists in jewelry-making, electronics, and fine crafts, it delivers sharp, strain-free optics in a durable, lightweight design.

## Description

The Donegan OptiVISOR is a hands-free, headband binocular magnifier that has optical glass lenses that are ground and polished into prismatic lenses for quality and clarity, and is available in multiple dioptric strengths (indicated by the number in the model) which provide specific magnification power (X) at specific focal lengths, or distance from object. This magnifier enhances the size and resolution of an object or image, and is commonly used for a variety of applications such as jewelry-making, watch- making, needlework, artwork, electronic inspection, book-reading, print inspection, and stamp-collecting.The OptiVISOR magnifier features replaceable binocular lenses that have beveled edges that are mounted in an interchangeable plastic frame. An adjustable headband with padded leather comfort band conforms to a variety of head sizes and provides comfort for hours of continuous use. It can be worn over prescription or safety eyeglasses. A durable, plastic visor tips up above the forehead when not in use. Spring-loaded pivot screws hold the headband in a raised or a forward-facing position. The magnifier weighs 0.67 lbs., and comes housed in a protective shell and carrying case. It has a one-year limited warranty.Diopter (D) is a technical term for the measurement of the light curvature and thickness of a lens. A dioptric number and a magnification number are not the same thing. Diopter strength represents a specific magnification power (X). For example, a 5-diopter provides 2.5X magnification (at a distance of 8”). See the magnification chart. The higher the diopter, the more magnification a lens can provide. As magnification increases, distance to the object (focal length), and field of view (diameter, or narrowness of view) decreases. Magnifiers and prescription eyeglasses have a diopter value, such as 1.5 or 2. The dioptric strength of an accessory lens, such as prescription eyeglasses or an eye loupe, must be added to the dioptric strength of the magnifier to calculate total magnification.Magnifiers are devices used to enlarge the visual appearance of an object or image. Magnifiers come in a variety of styles such as hand-held, headband, standing, clip-on, eye loupe, and those that hang in a necklace form, or fit in a trouser pocket. Magnifiers are commonly made of plastic or glass. They can have one or more lenses with varying magnification abilities, and can have a binocular configuration with a single lens, or two separate lenses. They are sometimes used with LED or fluorescent light sources to help control viewing capabilities. Magnifier ability is often expressed as magnification at a specific length. For example, 1.75X at 14” means that when a magnifier is held at 14” from a viewer’s eyes, the object will be magnified 1.75 times (X) its actual size. As magnification increases, viewing areas and focal length decrease. Magnifiers sometimes have a diopter number, expressed as + or -D, which is a measurement of strength (or power) of the lens. Some magnifiers are marked with a dioptric number on the lens. A high diopter number has a higher magnification than a low diopter number. Aspheric magnifiers, unlike spheric magnifiers, produce a sharp image to the edge of the lens for less distortion. Magnifiers are widely used in jewelry inspection and fabrication, watch-making, needlework, artwork, reading, print inspection, and stamp-collecting.Determining MagnificationDiopter Magnification Focal length (Distance from object) Sample view 20/20 vision 20" (50.8cm) 2-diopter lens 1.50X 20" (50.8cm) 3-diopter lens 1.75X 14" (35.56cm) 4-diopter lens 2.00X 10" (25.4cm) 5-diopter lens 2.50X 8" (20.32cm) 7-diopter lens 2.75X 6" (15.24cm) 10-diopter lens 3.50X 4" (10.16cm) Donegan Optical manufactures and distributes precision visual devices for hobbyists and professionals in industry, home, office and crafts applications. The company was founded in 1952 and is headquartered in Lenexa, Kansas.What’s in the Box?OptiVISORFitted, plastic, carrying caseInstruction manual

Review: Comfortable and built well - Expensive, but are comfortable and well made. I program CNC machines and use these for surface inspections and overall cosmetics of the high quality our product demands. Great for any high detailed work needed. Take out slivers with precision tweezers with ease. Great for crafts also. I keep 1 in work and another for home and travel trailer. If you need it it is indispensable.
Review: OptiVisor - Very impressed - After years of considering, I am glad I finally bought one!! - Being one with eyes of advancing years ;-) I often find myself reaching for magnifying glasses for reading small print, and using my desk mounted magnifier lamp for working on projects with small / intricate parts. My desk magnifier is in the 2.25 - 2.5x range, and it is a high quality optic / magnifying lens with a fluorescent bulb to light up the work. It is a nice lamp, but there are times I want a little more mobility and other times where I don't like working with the lamp hanging in front of me! I am very happy I took the plunge and tried the Optivisor (I bought the 1.75x for starters). in the first few days I owned it, I used it 4 or 5 times on projects - with the most recent being when I had to find the CMOS jumper on my sons motherboard and reset it whilst the board was still in the computer. The Optivisor came in REAL handy - and having the 1.75x meant I could stay a workable distance back from the work without having to stick my face right next to it! Now, I used a flashlight and rested / pointed it at the work - so I can see some benefit on perhaps getting the LED light attachment for this. Now I have to debate spending $30 for that - which will of course make me consider building my own being the "tinkerer" that I am.Now that I have used it, I am already considering the 2.5x lens attachment as an accessory to the head band. I wish they made a 2.25x lens. In summary, here is what I like about the Optivisor: - The band fits my 7 7/8" head! I often have trouble with head-wear / hats due to my large dome ;-) and it is nice to see this fits with room to spare! - The adjustment knob on the back is easy to use, and you can snug it up comfortably without it becoming uncomfortable. - The lens / optic is quite good, the clarity is good, the focal point has a good + / - range of a couple of inches such that if you move, the work stays relatively still in focus. - The fact you can swap out different lenses on the same head piece is nice, gives you options depending on the project at hand. - The flip-up eyepiece is wonderful, you don't have to take the Optivisor off your head when you don't want magnification for a brief moment or more - and being a comfortable head band is a plus to that! What would have been nice to have: - An integrated lighting system would have been nice as a stock option - I would have paid more for that. There are after market LED lights, but they run on AA batteries, and add a big block to the side of the Optivisor to house the batteries when mounted on the band. I am worried about the extra weight on one side as a result. Overall, Highly recommended tool - I would buy it again!! Thanks for reading. UPDATE: I liked the Optivisor so much, I bought another replaceable lens at 2.5x! This is a very handy tool...

## Features

- Headband binocular visor with snap-in 2X magnifying lens plate for hands-free viewing
- Ground and polished glass prismatic lens for improved focus and reduced eye strain
- Visor size-adjustment knob for customized fit
- Visor tilts out of way when not needed
- 10" focal length for a variety of uses

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0015IS6K2 |
| Batteries Required? | No |
| Best Sellers Rank | #53,076 in Health & Household ( See Top 100 in Health & Household ) #116 in Magnifiers |
| Brand | Donegan Optical |
| Color | Blue |
| Date First Available | November 19, 2003 |
| Department | mens |
| Global Trade Identification Number | 00633096000496 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 6.4 ounces |
| Item model number | DA-4 |
| Lens Material | Plastic |
| Magnification Strength | 2 x |
| Manufacturer | Donegan Optical |
| Power Source | battery-powered |
| Product Dimensions | 10.5"L x 8.1"W |
| UPC | 781624993960 633096000496 654207151982 |

## Product Details

- **Batteries Required?:** No
- **Brand:** Donegan Optical
- **Color:** Blue
- **Item Weight:** 0.4 Pounds
- **Lens Material:** Plastic

## Images

![Donegan DA-4 OptiVISOR Headband Magnifier, 2X Magnification Glass Lens Plate, 10" Focal Length - Image 1](https://m.media-amazon.com/images/I/71Is0pkflnL.jpg)

## Questions & Answers

**Q: How is this product better than magnifying glasses?**
A: I advise you to read the perfect comment that  chezphyl answered on June 1, 2014.I copy it here for you:  It's easy to "bump" them up when not in use and back down when you need them. They remain on your head so you don't have to lay them down somewhere. When positioned down quite far you can look up (over the top of the eye glass frame) to see things normally, such as TV or another person. I use them this way a lot of the time. There's also an optional light that attaches to the unit if you need more light on the work object. I have not purchased that, because I have numerous work lights that suffice. Pay close attention to the distance you will have from your face to the work piece as this will determine the lens power to order. One set of lenses is included, but you can purchase additional lenses if you plan to use the headset for hobbies requiring varying distances. If you presently wear regular prescription glasses you can wear them under the device. Previously, I tried attaching magnifying glasses onto my reading glasses and they didn't attach well, but that may have been because my glasses were too small or the quality of the magnifying clip-ons I chose. This is the most convenient solution I've found so far for very small, very precise stitchery.

**Q: light**
A: If you are asking if it has a built-in light the answer is no.  If you are asking if it is light in weight, the answer is it is not heavy enough to be uncomfortable.  I have not weighed it but it fits well on my head and indeed when I am engaged in a project, I sometimes forget it is there.  It provides a clear, undistorted view of whatever you are working on.  The focal length is about right for working on small objects.  I do not know if the less expensive magnifiers have lenses comparable to the one in the Donegan Optivisor.

**Q: I am very nearsighted and must wear glasses all the time. I am assuming this tool is only to be without glasses . is that correct?**
A: Actually i wear it with my glasses all the time without any trouble.

**Q: Is this made in China?**
A: No. It's made in the USA. I avoid buying anything made in China.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Comfortable and built well
*by A***R on December 18, 2025*

Expensive, but are comfortable and well made. I program CNC machines and use these for surface inspections and overall cosmetics of the high quality our product demands. Great for any high detailed work needed. Take out slivers with precision tweezers with ease. Great for crafts also. I keep 1 in work and another for home and travel trailer. If you need it it is indispensable.

### ⭐⭐⭐⭐⭐ OptiVisor - Very impressed - After years of considering, I am glad I finally bought one!!
*by T***S on September 28, 2013*

Being one with eyes of advancing years ;-) I often find myself reaching for magnifying glasses for reading small print, and using my desk mounted magnifier lamp for working on projects with small / intricate parts. My desk magnifier is in the 2.25 - 2.5x range, and it is a high quality optic / magnifying lens with a fluorescent bulb to light up the work. It is a nice lamp, but there are times I want a little more mobility and other times where I don't like working with the lamp hanging in front of me! I am very happy I took the plunge and tried the Optivisor (I bought the 1.75x for starters). in the first few days I owned it, I used it 4 or 5 times on projects - with the most recent being when I had to find the CMOS jumper on my sons motherboard and reset it whilst the board was still in the computer. The Optivisor came in REAL handy - and having the 1.75x meant I could stay a workable distance back from the work without having to stick my face right next to it! Now, I used a flashlight and rested / pointed it at the work - so I can see some benefit on perhaps getting the LED light attachment for this. Now I have to debate spending $30 for that - which will of course make me consider building my own being the "tinkerer" that I am.Now that I have used it, I am already considering the 2.5x lens attachment as an accessory to the head band. I wish they made a 2.25x lens. In summary, here is what I like about the Optivisor: - The band fits my 7 7/8" head! I often have trouble with head-wear / hats due to my large dome ;-) and it is nice to see this fits with room to spare! - The adjustment knob on the back is easy to use, and you can snug it up comfortably without it becoming uncomfortable. - The lens / optic is quite good, the clarity is good, the focal point has a good + / - range of a couple of inches such that if you move, the work stays relatively still in focus. - The fact you can swap out different lenses on the same head piece is nice, gives you options depending on the project at hand. - The flip-up eyepiece is wonderful, you don't have to take the Optivisor off your head when you don't want magnification for a brief moment or more - and being a comfortable head band is a plus to that! What would have been nice to have: - An integrated lighting system would have been nice as a stock option - I would have paid more for that. There are after market LED lights, but they run on AA batteries, and add a big block to the side of the Optivisor to house the batteries when mounted on the band. I am worried about the extra weight on one side as a result. Overall, Highly recommended tool - I would buy it again!! Thanks for reading. UPDATE: I liked the Optivisor so much, I bought another replaceable lens at 2.5x! This is a very handy tool...

### ⭐⭐⭐⭐⭐ Nearsightedness, eyeglass correction vs. the visors, comparison of DA-2, DA-3, DA-4
*by A***N on August 30, 2017*

This is actually a discussion about three of the Donegan visors: the DA-2. DA-3, and DA-4. Who knows how Amazon groups or separates reviews now. Hopefully this will be accessible and helpful to people seeking all three. They're good quality, as expected, with glass lens plates in the DA series. Note that if you are nearsighted, your eyesight as well as the correction already present in your glasses affect the working specifications of the visor, even more so if you wear bifocals or progressives. This means that the focal length advertised for the Donegan visors will not be your working distance. I cannot speak to correction for farsightedness. Since I'm involved in many interests and wasn't sure how I wanted to trade off magnification and working distance, I bought DA-2, DA-3, and DA-4. I find that despite the many recommendations to stay with the lower powers, which I well understood, I often need the magnification of the DA-4. You may be different. It depends on you and the type of work. I recently had to replace some surface-mount capacitors. They weren't absolutely miniscule, about 3mm diameter, but I needed the DA-4 to see the solder pads clearly enough. But here's the gist. I was surprised by the actual working distances I achieved with all three visors. My uncorrected vision is awful, something like 20/325 and 20/375, maybe a little better as I've aged. My clear vision extends about 9 inches from my corneas, then I'm done. I wear progressives and I use every bit of them, the very tops of the lenses for driving, the very bottoms for any close work. Here's what I get, the usable distance from the work to the visor lens plate. These measurements are close, but not necessarily perfect. * DA-2: Advertised focal length, 20 inches With my glasses, distance, 14 inches With my glasses, near, 7 inches No glasses, 5.5 inches * DA-3: Advertised focal length, 14 inches Glasses, distance, 11 inches Glasses, near, 6 inches No glasses, 4.5 inches * DA-4: Advertised focal length, 10 inches Glasses, distance, 10 inches Glasses, near, 5 inches No glasses, 4 inches To summarize, all but one of the practical working distances are far shorter for me than the advertised focal lengths, eyesight corrected or not. Even the DA-2, which is probably the most-recommended visor, is a bit short for many activities. The distances decrease with more powerful visors, as expected, but are not always linear. The DA-2 improves my working distance slightly when using the near-vision portion of my lenses versus uncorrected; the others decrease it. All decrease my uncorrected-vision working distance, workpiece to eyeballs. I have an outstanding optometrist who works at one of the local laser surgery clinics. He is so far ahead of the usual ones. We've had long discussions about lens power, and one thing he's told me is that there is no obvious set point of "correct correction" for nearsighted eyes. He says that most people, in the exam, will keep wanting more and more correction, beyond what they actually need. He first reduced my correction and improved the balance of my vision. He makes it a practice to not let people get into stronger lenses than they should ideally have. I bring this up because I'm puzzled as to why my 20/20 corrected distance vision doesn't agree with the Donegan focal lengths except for the DA-4. The weaker the Donegan power, the more the divergence for me. Makes me wonder whether there's a connection to this slightly-weaker distance correction I have. Seems to make sense, but I'm not well-informed enough to know...I'll ask at the next exam. The depth of field is so shallow with these visors that you won't find it useful to "just move back a little" to gain more working distance. To my eyes, from the point of best focus (which is really quite good), there is a truly sharp range of about a quarter inch either way. A depth of +- 1/2 inch gets pretty blurry. Go an inch either way and it's not usable. If you labor under the notion that you'll have vision from "20 inches onward" with a DA-2, that's not true. You'll see from "19 to 21 inches." Lastly, I immediately feel cross-eyed when wearing the visors. I haven't measured, but I think the optical centers are narrower than my own and it strains my eye muscles. I can't wear them for long at a time. Don't misunderstand...I like the visors and do use them. I just don't have as much room as expected.

## Frequently Bought Together

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-01-23*