their good . only problem you half to put anything you're looking at up close to your face. instead arm length away. they be good take camping the magnification could start your camp fire for you.
i purchased the 2.0 and 3.0 versions. the 2.0 are clear at all angles. however, the 3.0 are only clear in the direct center of the lens. you have to be looking directly at what you want to see. so, you must turn your head, you cannot just turn your eyes, for things even slightly off center. it's annoying. i've checked all 5 pairs and they are the same.
i ordered a set of these readers not expecting too much, considering the price. but i did expect more than what i received. the lenses cause a distortion in the view. hard to explain, but the outer edges of view have the appearance of looking through a rounded bowl. it's not horrible, just weird. the biggest issue is in regards to the frames. very light weight and non-adjustable. looking downward, the glasses slowly start to slide off my head. i've tried bending the arms inward to no avail. i'm thinking of using my heat gun to try and reset the arms for a tighter fit. this purchase is worth it if like me, you need numerous pairs of readers scattered throughout your home and vehicles so you have a set when needed and your good sets are nowhere to be found.
they are ok i use them but the field of view is too small i think. i am conscious of the lens frame. i ware prescription glasses for distance i don’t have that problem.
需要近距离观看
有限的观看距离
视野限制
视图扭曲
视场畸变
视野受限