Yes, -7.5 eyesight is considered quite bad, indicating significant nearsightedness (myopia). This means you have difficulty seeing objects clearly at a distance.
Here's a breakdown:
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The Minus Sign: The minus sign (-) indicates that you are nearsighted. This means your eye focuses light in front of the retina, rather than directly on it, causing distant objects to appear blurry.
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The Number (7.5): This number, measured in diopters (D), represents the strength of the lens correction needed to focus light correctly on your retina. A higher number (further from zero) indicates a stronger prescription and a greater degree of nearsightedness.
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Severity: Generally, prescriptions are categorized as:
- Mild Myopia: -0.25 to -3.00 D
- Moderate Myopia: -3.00 to -6.00 D
- High Myopia: -6.00 D or more
Therefore, -7.5 D falls into the high myopia category.
What this means for you:
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Distance Vision: Without corrective lenses (glasses or contacts), your distance vision will be very blurry. You'll have trouble reading road signs, seeing the board in a classroom, or recognizing faces from afar.
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Daily Life: You will almost certainly need corrective lenses for most daily activities, especially those requiring good distance vision like driving, watching movies, or playing sports.
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Potential Risks: High myopia is associated with an increased risk of certain eye conditions later in life, such as:
- Retinal detachment
- Glaucoma
- Myopic macular degeneration
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Management: Regular eye exams are crucial to monitor eye health and detect any potential problems early. Your eye doctor can also discuss options for managing myopia progression, especially if you are younger.
In summary, -7.5 eyesight signifies significant nearsightedness requiring corrective lenses and regular monitoring for potential eye health risks.
