When traveling near the speed of light, the visual perception of objects passing by would not necessarily appear blurry or clear in the way we typically understand it. Instead, several relativistic effects would come into play, altering the way objects are observed.
One of the key phenomena is known as relativistic aberration or relativistic Doppler effect. As an observer moves close to the speed of light, the light emitted from objects in their field of view undergoes a shift in frequency and direction due to their relative motion. This effect causes the light from approaching objects to be blue-shifted (compressed towards shorter wavelengths), while the light from receding objects is red-shifted (stretched towards longer wavelengths). This can lead to a change in the apparent color of objects.
Additionally, as the observer approaches the speed of light, time dilation occurs. This means that the observer's perception of time slows down relative to a stationary observer. As a result, the rate at which the observer processes and perceives the changing scenery may be altered.
Furthermore, there is a phenomenon known as Lorentz contraction or length contraction. Objects that are in motion relative to the observer will appear foreshortened in the direction of motion. This contraction of length can affect the visual appearance of objects passing by, making them appear compressed along the direction of travel.
The combination of these relativistic effects can significantly alter the visual perception of objects when traveling near the speed of light. However, it's important to note that these effects become more pronounced as an observer approaches the speed of light, which is an incredibly high velocity that is not achievable by objects with mass according to our current understanding of physics.