The phrase "allowed a viewer to" is correct and usable in written English.
It can be used when discussing the permissions or capabilities granted to someone in relation to viewing content or information.
Example: "The new software update allowed a viewer to access previously restricted features."
Alternatives: "permitted a viewer to" or "enabled a viewer to".
The service also allowed a viewer to watch TV and use the Internet at the same time.
Whereas broadcast TV allowed a viewer to receive the signals of nearby stations over the air with the help of an antenna, cable technology brought a much wider array of channels directly into the home by way of a coaxial cable.
But still, it was solid reporting about provocative topics at a pace that allowed a viewer to not just hear but to absorb.
As such, the procedure aimed to mobilize the infant's expectations about what happens when anxiety about the availability of the attachment figure has occurred in the past, and allowed a viewer to interpret these expectations from observed behavior.
The eight binders stuffed with items, carefully arranged chronologically, will allow a viewer to peruse the Cino decade.
The close-up, he said, allows a viewer to see emotion on dancers' faces, enhancing a work's theatricality.
And, as Mr Wilkinson wrote, "a widescreen plasma television is a delight, but a cheap 19-inch TV is enough to allow a viewer to laugh at Shrek".
Whereas ironic consumers feel apart and above the cultural object, a camp sensibility allows a viewer to identify with the creators of the movie or television show.
But they also include a 3-D interactive figure that allows a viewer to see and interact with the 3-D model.
Software that would allow a viewer to choose a path to travel around a highly detailed neighborhood in real time does not yet exist.
An "ecology of images," she argued, might allow a viewer to see just enough pictures to maintain a sense of outrage.
