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Spherical lenses are traditional, curved lenses, while aspherical lenses offer similar vision correction with a less bulky profile. There are pros and cons to each of these lens types. This article will explore some of the differences between these lenses and when one style might be preferred over another.

The 14 lessons follow a sequence that progresses through the basics of plate tectonics, seismology, minerals and rocks, and geologic time and concludes with overarching topics such as Earth's major geologic features and economic geology resources.

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The laboratory kit and manual are part of an intensive laboratory course that explores the basic concepts and principles of physical geology. The kit is designed to be used in all delivery modalities.

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Students will be able to effectively apply concepts, principles, and theories of physical geology to make accurate observations and identify samples, structures, and landscapes. They will also analyze data, formulate and test hypotheses, solve problems, and come to supportable conclusions given various scenarios and research topics.

Gray or black is the most common tint for a sunglass lens. They provide enhanced optics and clear vision on sunny or cloudy days. Colors will look the truest through a gray-tinted lens. They provide the best color enhancement and protection against glare. If you’re looking for a lens tint you can use daily, select gray.

The production of spherical lenses can be done on a larger scale in batches. Aspherical lenses, however, are created one at a time using special machines. This special manufacturing process results in a more precise product but also raises the cost of aspherical lenses compared to spherical lenses.

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Acknowledgments Preface: How to Take This Lab Course Lesson 1 Topographic Maps Lesson 2 Plate Tectonics Lesson 3 Rock Deformation and Mountain Building Lesson 4 Earthquakes and Seismology Lesson 5 Minerals Lesson 6 Igneous Rocks and Volcanism Lesson 7 Sedimentary Rocks Lesson 8 Metamorphism and Metamorphic Rocks Lesson 9 Geologic Time Lesson 10 Mass Wasting Lesson 11 Streams and Groundwater Lesson 12 Oceans and Coastlines Lesson 13 Glaciers Lesson 14 Economic Geology and Resources Appendix Tables for Reference

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Your prescription and the amount or specific type of vision correction you need will play a large role in the type of lens you choose. However, both spherical and aspherical lenses can meet the needs of most prescription strengths. You might make a personal choice between one lens or another based on the style and appearance you want, along with what price you can afford or what your vision insurance plan covers OvernightGlasses.com offers a variety of lens options for a complete pair of eyeglasses and automatically match your prescription with Aspheric lenses at no additional charge. When you select to use our lens replacement program or to order a complete new pair of glasses from Overnight Glasses, you can be certain that your lenses will be as thin and aesthetically looking as possible.

Spherical lenses are usually thicker because of their more rounded shape. This will give these lenses a “Coke bottle” type of appearance. Aspherical lenses are thinner, with a less obvious profile. This usually makes aspherical lenses more stylish or aesthetically pleasing, but you might not have a choice if you require a multifocal prescription such as progressive and no-line bifocals.

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Rachael Zimlich, RN, BSN, has been writing for a variety of news and health publications for more than 20 years.... "Read More"

Aspherical lenses have a slight curvature that is sometimes difficult to see with the naked eye. The curvature of these lenses is a more gradual curve than in spherical lenses and creates a more precise focus of light on the retina.

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Spherical and aspherical lenses are two options of lens shapes. Spherical lenses are typically more bulky but also cheaper. Aspherical lenses have a slimmer design and can fit into more frames but might cost more. Talk to your eye doctor or optometrist about the best options for your prescription. Overnight Glasses has staff that can help you place the right order for your vision needs.

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Outside of the basic shapes, other key differences between these lens types may factor into your decision of which lens type to choose.

Traditionally, stronger prescriptions have required thicker lenses. Aspherical lenses allow you to have increased vision correction without added thickness. Both lenses can deliver a sharp focus for even strong prescriptions. The aspherical lens, however, has a somewhat superior performance with less bulk than spherical lenses.

Spherical lenses are the most common lens type and are often considered the standard lens type. These lenses are curved on at least one side. The curvature of the lens is crafted to focus light in a way that best enhances your vision. This is typically done with a convex (converging) or concave (diverging) lens curve. Your eye doctor will order a specific curvature based on your vision needs, and the lens maker will match the lens curvature to the prescription.