SPH (sphere) shows the lens power needed to correct nearsightedness or farsightedness. CYL (cylinder) indicates the power required to fix astigmatism. Together, SPH and CYL help eye care professionals create precise prescriptions for glasses, ensuring clear vision for various visual problems. On the other hand, “cylinder” defines astigmatism. Astigmatism occurs when the cornea or lens … Read more
Anti-reflective coating, or AR coating, is a treatment for lenses that reduces glare and reflections. This coating improves lens clarity and enhances visual comfort. It also helps lessen eye strain, especially in bright light. AR coating is particularly useful for prescription glasses, providing clearer and more comfortable vision. Furthermore, AR coating reduces eye strain. It … Read more
AR with backside UV refers to an anti-reflective coating applied to the back of prescription glasses. This coating blocks ultraviolet light and reduces glare from reflections, improving visual clarity and comfort. It’s particularly beneficial in sunglasses, protecting eyes from harmful UV rays and enhancing overall vision quality. The term “W” refers to water-repellent properties that … Read more
Anti-fog for prescription glasses stops lenses from fogging. This fogging happens when warm, moist air meets cool lenses, creating condensation. An anti-fog coating forms a barrier that blocks this moisture, ensuring better clarity and visibility. It improves comfort for the wearer in different environments. There are various types of anti-fog coatings available. Some are permanent … Read more
Adding astigmatism correction to a glasses prescription means including a cylindrical value (CYL) alongside the spherical value (SPH). Astigmatism arises from an irregular cornea shape, which impacts vision clarity. The CYL value compensates for this shape, improving overall eye health and ensuring clearer vision. A glasses prescription designed for astigmatism includes specific parameters. These include … Read more
Progressive prescription glasses use progressive lenses, or multifocal lenses, to transition smoothly between three vision zones: near vision, middle vision, and far vision. They offer visual comfort without visible lines. An adaptation period may be necessary for users. These glasses are ideal for presbyopia and enhance daily tasks like reading and driving. Many people prefer … Read more
The term “ADD 4BI” on a glasses prescription indicates the additional lens power needed for near vision correction. “ADD” signifies extra strength for reading and close tasks. The value of 4 diopters shows the extra power required for individuals with presbyopia or when using bifocals or progressive lenses. The prescription is often formatted into three … Read more
A plus sign (+) on a glasses prescription means you have farsightedness. This indicates that you see clearly at a distance but struggle with near vision. In contrast, a minus sign (−) indicates nearsightedness, where you see better up close and need vision correction for clarity at a distance. The plus sign’s presence in your … Read more
A positive power in a glasses prescription indicates farsightedness. This means you can see distant objects clearly but may have trouble with close-up vision. The plus sign (+) before the power number shows the lens strength needed for vision correction. This is important for maintaining eye health and achieving clear vision. People with a positive … Read more
A glasses prescription without astigmatism typically does not include a Cylinder (CYL) value. A negative sign (-) indicates nearsightedness. A positive sign (+) or no sign suggests farsightedness. Check the sphere (SPH) value for the overall lens power, which shows the prescription components for vision correction. The sphere value indicates the degree of nearsightedness or … Read more