Glasses as visual aids usually arouse mixed feelings. They correct nearsightedness, farsightedness, and a range of other visual deficiencies and help to perceive the world. On the other hand, there are also some disadvantages to eyeglass wearers.
The visual performance of people varies and changes over the years. Some people need glasses on children, others only in their old age. The manufacturers of binoculars must take this fact into account.
Eyeglass wearer eyepieces as a tool
As eyeglass wearers, eyeglass wearers were developed by the binoculars producers. In eyeglass wearer eyepieces, the exit pupil is placed further back, so that one can also survey the entire field of view with attached eyeglasses. These glasses wear eyepieces usually consist of numerous lenses (up to 8 lenses), especially when the field of view is large and you want a high light intensity. For this purpose, special glass is usually used for the eyepieces, which also leads to the fact that the binoculars in the production are costly. When buying, make sure that the product description explicitly lists glasses wear eyepieces. Only then is the use possible for spectacle wearers.
Glasses fog in cold temperatures. Rain, fog, dust, and pollen quickly collect on the lenses and make sure they have to be cleaned frequently. If you want to use a pair of binoculars, you will face even more challenges. However, with a bit of cleverness and preparation, most problems can be avoided.
The most common problem for eyeglass wearers is an inadequate “eye relief.” This is the distance between the eye and the eyepiece needed to see the full field of view. In many cases, this is just too short for wearers of glasses. Modern binoculars have, depending on the design and the magnification, an eye relief between 12mm and 20mm.
The user must position his eye at the model-specific distance to the eyepiece so that he can see the entire image. Without glasses, you can lead the binoculars directly to the eye. But when wearing glasses, this also takes up space between the eye and binoculars, leading to a higher distance. Depending on the type and thickness of the lenses, the range may be higher than the eye relief of the binoculars allows. In this case, one could only see a smaller part of the field of vision with glasses.
To better position the eyes behind the eyepieces, and to avoid being dazzled, most binoculars have plastic or rubber eyecups that sit directly around the eyepieces. Not so long ago, these were made of hard rubber and could not be adjusted. This meant that binoculars were previously unsuitable for spectacle wearers.
Fortunately, the times and designs of binoculars have changed. Modern appliances usually have soft rubber eyecups that can be folded down or even infinitely adjustable – for example, by pulling or pushing.
Now you can ask yourself the obvious question: “Why not just use the binoculars without glasses?”. First of all, it is impractical, as the glasses have to be stored somewhere as soon as they have been removed, where they do not get dirty or break. It gets worse with activities that require a quick response time. When bird watching, you have to be very nimble and focus the binoculars quickly, with the glasses off and put on then unnecessarily costs time. The likelihood of the glasses falling is even higher.
Then, of course, there is the reason why the glasses are even worn: To correct vision problems. While binoculars also allow some adjustment by focusing, this correction is limited and does not help with all types of visual impairment that wearers of glasses typically may have.
Also, vision defects are often exacerbated by the magnification of the binoculars. Taking all this together, it becomes obvious why binoculars for eyeglass wearers are so often in demand. Without the glasses, the picture gets much worse, and one has little of the most expensive pair of binoculars.
The glasses you wear are often selected according to your taste and style. However, if you already know that he often wants to use them together with a pair of binoculars, you can make sure when buying that he selects a spectacle frame that positions the spectacle lenses as close to the eye as possible. This allows for the purchase of binoculars, a much more extensive selection of possible models. In some cases, however, it may be better to switch to contact lenses.
If you just need a glass, then you can do it.
If you wear glasses, another complementary step will give you a clear picture—retractable eyecups to fit eyeglass wearers. Without wearing glasses, pull out the eyecups as far as possible. With goggles, position the eyecups in the screwed-in position against the body of the binoculars. Attention: depending on the different vision disorders, additional settings may be required.