What can cause spectacle blur in lens wearers?

The option indicating temporary deformation of the corneal surface is a valid reason for spectacle blur in lens wearers. This phenomenon can occur due to various factors, including prolonged wear of contact lenses, environmental conditions, or even certain eye health issues. When the corneal surface is temporarily altered, it can affect how light is refracted as it enters the eye, leading to blurry vision. This type of blur may resolve once the cornea returns to its normal shape, making it a transient issue rather than a permanent one.

While other factors could also play a role in causing visual disturbances, such as misalignment of the optical center or excessive lens movement, these often result in consistent blurring rather than a temporary issue. Poor lighting conditions can affect visibility, but they don't directly alter the optical properties of the lenses or the eye like corneal deformation can. Thus, focusing on corneal deformation highlights an important aspect of how the eye's surface interacts with corrective lenses, underscoring the complexity of visual clarity in lens wearers.