Complete the sentence: "If you do not stop playing ________ video games in your room, your vision will deteriorate faster."

The correct choice is "those." In the context of the sentence, "those" is used to refer to a specific group of video games that are typically understood to be further away from the speaker, such as the ones being played in the room. The word "those" indicates plural and demonstrates a clear separation from the speaker, emphasizing the video games being referenced as distinct items.

Other options do not fit as well in this context. "That" is singular and would imply a specific, singular game rather than the plural form needed here. "This" also indicates singular and relates to something that is close to the speaker. Similarly, "these" suggests something that is close in distance and is plural, but it is more appropriate when directly referencing items in proximity rather than games being specifically played in a different location. Thus, "those" is the most appropriate word to convey the intended meaning of cautioning the listener about the potential negative effects of playing a certain collection of video games.