The reading ruler helps to prevent visual stress and enhance focus whilst reading and writing. By using the reading ruler, users can minimise the symptoms associated with Irlen syndrome such as headaches, fatigue, and discomfort. The portable size, protective film and zip bag ensures the ruler stays in pristine condition and makes it an ideal companion for students moving between classes and professionals on the go. The rulers work by adjusting the colour contrast of the text, reducing visual distortions and minimising the impact of glare and light sensitivity. Colours may vary (assorted colours of: blue, green, pink, orange and yellow). Pukka Pad Irlen Reading Overlay Ruler Assorted (Pack of 5) Buy One Get One Free