Which one of the following is a symptom denoted by 'S' in the uveal melanoma risk factors?

In the context of uveal melanoma risk factors, the letter 'S' is used to denote symptoms that are subtle and may not always be immediately alarming. Symptoms like floaters or blur refer to changes in vision that can occur when the tumor affects the eye's internal structures. These changes are often less obvious than severe pain or sudden vision loss, which can indicate more acute issues. Therefore, floaters or blurriness may be experienced as a gradual decline in visual quality, aligning with the 'S' designation. This understanding helps categorize possible symptoms in a more nuanced way, emphasizing that some signs can be easily overlooked, potentially delaying diagnosis and treatment.