Can overcorrection of astigmatism worsen the condition?
Jun 29, 2022
Source: Cainiu Health
Dr. Chen You
Introduction
Can overcorrection of astigmatism worsen the condition? This depends on the specific nature of the condition. In cases of physiological astigmatism, gradual improvement and recovery may occur through daily lifestyle adjustments, and the condition will not deteriorate. However, pathological astigmatism—without timely treatment and management—can easily progress. Astigmatism is classified into regular and irregular types based on its underlying cause.
In recent years, astigmatism in children and adolescents has become increasingly severe. With rapid advancements in science and technology, many children begin using smartphones, computers, and other electronic devices at a very young age. Prolonged screen exposure over time may lead to declining visual acuity and worsening astigmatism—potentially exerting significant long-term impacts on daily life and future development. Therefore, once astigmatism is detected in children, timely correction is essential. But can overcorrection of astigmatism exacerbate the condition?
Can overcorrection worsen astigmatism?
Whether overcorrection worsens astigmatism depends on the specific nature of the condition. In cases of physiological (functional) astigmatism—which is typically mild and often present from birth—vision may gradually improve with appropriate lifestyle adjustments, and the condition generally does not progress. However, pathological astigmatism, if left untreated or uncontrolled, may indeed deteriorate. Astigmatism is broadly classified into regular and irregular types, depending on its underlying cause. Regular astigmatism usually results from congenital, asymmetric corneal or lens development, whereas irregular astigmatism commonly arises from corneal abnormalities such as localized scarring or keratoconus following trauma or disease.
Physiological astigmatism typically remains stable throughout life, showing minimal or no change with age. In contrast, pathological astigmatism may progressively worsen over time—for instance, in keratoconus, astigmatic error often increases with age and, in severe cases, may even lead to corneal perforation. Thus, individuals diagnosed with astigmatism must undergo comprehensive refraction testing at a reputable medical institution to accurately determine both the type and degree of astigmatism.
If astigmatism is present, it is advisable to reduce screen time on electronic devices, increase outdoor activity, consume more fresh fruits and vegetables, and avoid using night lights during sleep. Additionally, maintaining healthy ocular habits—including proper lighting, correct reading posture, and avoiding eye strain—is crucial to prevent progression. We hope this information proves helpful.
