Irlen Syndrome is a perceptual problem (not a visual problem). It affects HOW we see print when reading. It is not corrected with ordinary reading glasses. It is treated with colour using the Irlen method. It can affect achievement, learning and performance for struggling readers. For good readers it can limit the time they can read with comfort and understanding. People with Irlen Syndrome may have slow and inefficient reading, experience strain, tiredness or have poor comprehension. Those with Irlen Syndrome often do not make significant progress from instruction and remediation. Irlen Syndrome is not detected by standard educational, visual or medical tests.