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http://www.vvdeals.com/products/3D-VR-Virtual-Reality-Glasses-BOX-for-3-6-inch-Smartphone-Upgrade-Version_153.html object distance and focal length are adjustable our VR lenses do the least harm to your eyes in the current market. With adjustable object distance and focal length, it will bring you a comfortable experience.Suitable for myopic within 600 degree,but not for presbyopia. Only care Heath of your eyes FOV is about 75 degree, bigger fov is harmful for eyes as its distance is too close, and will get dizzy after minutes. Our R&D team have spent lots of time to test the better distance for watching 3D movie or play game healthly.