Max. phone screen size
The largest diagonal of a smartphone compatible with the corresponding glasses (see "Intended use"). Note that this parameter can be specified both for universal models that do not have specialization for specific mobile phones, and for gadgets for specific devices (for more details, see "Compatible phone models"). The maximum diagonal is connected both with the features of the optics and with the physical dimensions of the "seat" for a mobile phone — a gadget that is too large simply does not fit there.
Note that even the smallest glasses for smartphones work quite correctly with devices with a diagonal of
5 – 5.5 ". So it makes sense to pay attention to this parameter if your device has a larger screen size. Nowadays, you can find glasses for gadgets
5.6 – 6 " and even
6" or more.
Compatible phone models
Models of mobile phones with which glasses of the corresponding type are initially compatible (see "Intended use").
This parameter is indicated for models originally created for specific smartphones — most often advanced flagship models; These glasses may not be compatible with other gadgets. On the one hand, this limits their application; on the other hand, the design may provide various specific features that are available only through close integration with a specific smartphone.
Also note that the characteristics may indicate compatibility not with a strictly defined model, but with a whole line — for example, iPhone. In such cases, it's ok to clarify which devices from the line are designed for glasses; the easiest way to figure this out is from the data on the maximum diagonal (see above).
Field of view
The viewing angle provided by virtual reality glasses is the angular size of the space that falls into the user's field of view. Usually, the characteristics indicate the size of this space horizontally; however, if you need the most accurate information, this point needs to be specified separately.
The wider the viewing angle — the more the game space the user can see without turning his head, the more powerful the immersion effect and the less likely that the image will be subject to the "tunnel vision" effect. On the other hand, making the field of view too wide also does not make sense, given the characteristics of the human eye. In general, a
large viewing angle is considered to be an angle of 100° or more. On the other hand, there are models where this indicator is 30° or even less — these are, usually, specific devices (for example, drone piloting glasses and augmented reality glasses), where such characteristics are quite justified given the overall functionality.
Cooling system
The presence of its own cooling system in the design of the glasses.
This function is relevant for models designed for phones (see "Signal source"). Modern smartphones, especially powerful flagships, can get very hot under significant load (and working with virtual glasses, especially with a 3D image, is a rather "heavy" task); such heating adversely affects the technique, creates discomfort for the user and can even lead to burns. To avoid this, various solutions can be provided in the design to improve the efficiency of heat removal and reduce the likelihood of overheating.
Controller
The presence of a
controller — an additional control device — is included in the delivery of glasses.
The design and functionality of such an accessory may be different. So, the most popular option is specialized game controllers with a characteristic look — a handle with an analogue lever and buttons. There can be two such handles at once, under both hands; and in some models they are also used to control gestures. The movement of the hands can be tracked both by sensors in the controllers themselves and by cameras on the glasses. There are also simpler solutions — for example, portable gamepads or remote controls for controlling video playback.
