Screen aspect ratio distortion occurs when visual content appears stretched or squeezed, compromising image quality and user experience. The most effective prevention methods include using proper scaling techniques that maintain original proportions during resizing. Modern displays and software typically incorporate automatic aspect ratio preservation, but users should verify their resolution settings match their screen's native aspect ratio. For video content, selecting "original aspect ratio" or "native scaling" in media players prevents distortion. Graphic designers should always work with constrained proportions tools in editing software. When connecting external displays, ensure both computer and monitor settings align to avoid stretching. Responsive web design utilizes CSS techniques that maintain element proportions across different screen sizes. Game developers implement proper viewport management to prevent character and environment distortion. Understanding pixel density and using vector graphics where possible also helps maintain clean proportions across various devices.