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The primary purpose of a soft toric lens is to correct astigmatism. Unlike regular spherical lenses, which are designed for simple refractive errors such as myopia (nearsightedness) or hyperopia (farsightedness), toric lenses have different power in different meridians of the lens. This allows them to effectively address the irregular shape of the cornea that characterizes astigmatism, providing clearer vision for those affected by this condition.

Soft toric lenses not only help in correcting vision but also come with the comfort of soft lenses, making them easier to wear for extended periods compared to rigid gas permeable options. Their design enables them to align correctly on the eye, maintaining their position even with eye movements, which is crucial for the consistent correction of astigmatism.

The other options, while related to vision, do not reflect the core function of soft toric lenses. Providing a wider field of vision or enhancing color vision does not specifically pertain to the unique corrective function necessary for astigmatism. Similarly, aiding night vision is not a direct purpose of soft toric lenses, as night vision correction pertains more to other types of lenses or treatments designed for low-light conditions.