Human: How do I know if I need glasses or if it's just my eyes getting worse? Assistant: 
It is best to consult with a doctor for an accurate diagnosis. However, you can try some self-assessment tests such as the cover test, which involves covering one eye and trying to identify letters on a chart at arm’s length. If you cannot read the chart, then you may be nearsighted. You should also check your prescription regularly so that you can monitor any changes in your vision.