Blog by Nations Optics

Same prescription, different lens curve. Here's how aspheric and spherical lens designs differ in thickness, appearance, and distortion — and which one fits your prescription.

Headaches, dizziness, or blurry vision after new glasses? Here are the 10 most common wrong-prescription symptoms, how to tell them apart from normal adjustment, and what to do next.

Long hours on CAD, BIM, and 3D modeling take a toll on your eyes. Here's how to choose glasses built for architects — from lens coatings to frame shapes to daily comfort.

Thick, heavy lenses aren't your only option for a strong prescription. Here's how high index lenses reduce thickness and weight — and whether they're worth the extra cost.

Contact lens and glasses prescriptions aren't interchangeable. Here's why they're calculated differently, what BC and DIA mean, and how to know which correction option is right for you.

Having a different prescription in each eye is more common than you think. Here's what causes anisometropia, the symptoms to watch for, and how properly customized lenses fix it.