What does a spherical lens power of -3.75 mean?
Nov 19, 2025
Source: Cainiu Health
Dr. Wang Lei
Introduction
From the perspective of eyeglass prescription and daily care, this level of myopia requires correction with appropriate concave lenses to help focus light accurately on the retina and improve distance vision. A comprehensive refraction examination is necessary before prescribing glasses to determine whether other refractive errors such as astigmatism are present, thus avoiding inaccurate lens prescriptions. Daily habits should include managing eye usage time and avoiding prolonged close-up viewing of electronic devices or reading materials.
In general, a spherical lens value of -3.75 indicates 375 degrees of myopia. The "-" sign represents a myopic refractive state, and the spherical value is used to measure the degree of myopia. If in doubt, it is recommended to consult a medical professional promptly. Detailed analysis is as follows:
Myopia of 375 degrees falls within the moderate range. Patients may experience significant blurriness when viewing distant objects, such as road signs or writing on a blackboard, although near vision is usually not greatly affected. This level of myopia causes the eyes to over-accommodate when focusing on distant objects, which over time can lead to eye strain, dryness, and other discomforts—symptoms that become more pronounced after prolonged visual tasks.
From the perspective of eyeglass correction and daily care, individuals with this prescription require appropriately prescribed concave lenses to help focus light accurately onto the retina and improve distance vision. A comprehensive refraction examination should be performed before obtaining glasses to determine whether other refractive errors such as astigmatism are present, thus avoiding inaccuracies in lens prescriptions. It is important to manage daily screen time and avoid prolonged close-up work on electronic devices or reading materials to reduce the risk of further myopia progression.
Regular eye check-ups at certified institutions are recommended every six months to one year to monitor changes in vision. If symptoms such as dizziness or visual distortion occur after wearing glasses, a prompt re-evaluation and adjustment of the prescription are necessary. Additionally, ensuring adequate eye rest and increasing outdoor activities can help maintain long-term eye health.
