Final answer:
Without the exact chemical composition of SpotFree, the reaction with incompatible substances cannot be specified. A dry contact lens does not perform optimally without the tear layer of the eye, and vision underwater is blurry due to the different refractive index of water compared to air; face masks restore clear vision by providing an air pocket.
Step-by-step explanation:
The substances that SpotFree is not compatible with cannot be directly determined without more information about the product. Typically, such substances could include organic solvents, strong acids, or bases that may react with the ingredients in SpotFree. The actual reaction that occurs when SpotFree contacts incompatible substances would depend on its chemical composition, which is not provided. Therefore, a detailed scientific response cannot be given.
The power of a dry contact lens is typically designed to be optimal when resting on the tear layer of the eye. The tear layer provides a smooth refractive surface that allows light to pass through the lens and focus appropriately on the retina. Without this layer, the lens may be unable to properly bend light to the correct focal point, affecting its optical power and causing blurriness.
Vision is blurry underwater because the refractive index of water is different from that of air, which the eye is accustomed to focusing in. Consequently, the light bends differently when it enters the eyes from water, leading to unfocused images on the retina. A face mask restores clear vision by creating an air pocket in front of the eyes, allowing the light to bend as it would in air, and the eyes to focus normally.