What is the recommended practice when determining viewer distance based on image height?

The recommended practice of calculating distance using an industry standard ratio is based on established guidelines that aim to optimize the viewing experience. This ratio is designed to enhance visual clarity and comfort by suggesting an appropriate distance based on the image height displayed on the screen. For instance, common practices recommend that viewers sit a certain multiple of the screen height away from the screen—for example, 1.5 to 2.5 times the height of the image, depending on the resolution of the content.

By adhering to this standard ratio, designers can ensure that viewers have a pleasurable and immersive experience without straining their eyes or missing important visual details. Industry standards take into account the average human field of vision and help in minimizing distractions while maintaining optimal image perception.

The other options, while they may seem relevant to specific scenarios, do not provide a systematic approach that can be universally applied. Adjusting seating based on screen height might be helpful but lacks the precision of a standardized ratio. Relying on viewer feedback for adjustments can be too subjective, lacking the consistency needed for an effective design. Utilizing different viewing angles might enhance the experience, but it doesn't directly relate to finding an optimal viewer distance based on image size.