Based on the information provided about Alex's work habits and precautions, he is still at risk for the following computer-related health problems:
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Vision problems - Despite his good posture, prolonged computer use can lead to eye strain, dry eyes, and other vision-related issues, commonly referred to as digital eye strain or computer vision syndrome.
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Headaches - Extended screen time can also contribute to tension headaches, which may result from eye strain, poor posture, or screen glare, even if Alex is mindful of his posture.
So the answers are vision problems and headaches.