Human-computer interaction systems are primarily designed for devices that require physical intervention. Such devices are inappropriate in certain circumstances. It is important to support alternative solutions, especially for the physically disabled. This work focuses on interactions based solely on the user's gaze. In most cases, we have control over our gaze, even when standard interactions are not applicable. We explore the most appropriate interaction methods and develop our own method called two-level crossing, which is not based on dwell time. We implement methods based on dwell time selection, two-level tree-based selection, dwell time adaptation, and two-level crossing. We develop a writing application that includes the implemented methods. We integrate and test three eye-tracking systems for accuracy and precision. We evaluate all interaction methods with user tests. The single-level dwell time selection method achieves a median of 7.02 words per minute. The two-level crossing achieves a median of 3.74. Based on subjective evaluation, 31% of users select the method as the most appropriate for writing.
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