The following is a guest post by Rob Levin. Rob is a Senior UI/UX Developer at Mavenlink, and coauthor of the Unicorn UI CSS Button Library. Their 2.0 release is using an SVG icon system, and here he shares some issues he's ran into along the way, and how you can watch out for them and fix them.
Many causes of eye pain also cause the eye to look red (see Eye Redness). Other symptoms may be present depending on the cause of eye pain. For example, people may have blurred vision (see Vision, Blurred), a bulging eye (see Eyes, Bulging), or pain worsened by bright light. The cornea (the clear layer in front of the iris and pupil) is highly sensitive to pain.
Photophobia is not an eye disease, but a symptom of many conditions such as infection or inflammation that can irritate the eyes. Light sensitivity also can be a symptom of underlying diseases that don't directly affect the eyes, such as virus-caused illnesses or severe headaches or migraine.