Reading plays a crucial role in cognitive processes, acting as the primary way in which people access and assimilate information. However, the ability to effectively comprehend and understand text is significantly influenced by various factors related to people and text types. We propose to study the reading easiness and comprehension of texts through the eye-tracking technology, which tracks gaze and records eye movement during reading. We concentrate on the study of eye-tracking measures related to fixations (average duration of fixations and number of fixations). The experiments are performed on several types of texts (clinical cases, encyclopedia articles related to the medical area, general-language texts, and simplified clinical cases). Eye-tracking measures are analysed quantitatively and qualitatively to draw the reading patterns and analyse how the reading differs across the text types.