While contacts and glasses both improve your vision, there are a few differences in how these prescriptions work. There are several specialty and standard contact lenses available today, including: Another benefit is that contacts don’t fog up or get wet when the weather worsens.Ĭontacts come in many materials and designs for whatever your needs are. They can’t block your view like glasses frames, and the lenses move with your eye. There are several types of contacts available today, including:Ĭontact lenses can provide more natural vision. These thin discs sit directly on your eye, providing you with clearer vision.
Contact LensesĬontacts are the alternative to glasses. You can get a personalized pair of glasses that suit your style and visual needs. If you want a break from your lenses, all you need to do is take them off.īesides easy accessibility, glasses are customizable. They don’t require any cleaning solutions, and overall maintenance is low. Glasses are easy to use you only need to put them on, and you’re ready to go. You can get bifocal, trifocal, or progressive lenses, depending on your preference. If you struggle to see clearly from multiple distances, multifocal lenses are ideal. Glasses can serve many different purposes based on your needs, coming in 2 main types, single-vision or multifocal lenses. They’re a staple of vision correction, with millions using them daily. GlassesĪlmost everyone knows what glasses are. Both will help you see better, but what is the difference between these prescriptions?Ĭontinue reading to learn more about glasses and contact lenses, including the differences between these 2 prescriptions.
SPECTACLE RX PLUS
What’s the contact lens Rx?ġ) Sphere power = +5.00 D –> +5.00 + vertex factor of +0.25 D = +5.25 D at 180th meridianĢ) Sphere + Cylinder power = +5.00 – 1.00 = +4.00 D –> +4.00 + VF of +0.25 = +4.25 D at 90th meridianģ) Adjusted Cylinder power = -1.00 D + VF of +0.25 = -0.75 DĤ) Estimated Rx = +5.25 – 0.75 x 180 (Need to ADD -0.25 to cylinder power to obtain the Final Rx)ī) Minus spectacle Rx –> contact lens Rx (CLRx) = expect contact lens Rx to be LESS minus.Ĭ) Plus spectacle Rx –> contact lens Rx = expect contact lens Rx to be MORE plus.If your vision needs correction, your optometrist can write you a contact lens or glasses prescription. For every 2 D power change, you will require a vertex factor change of +0.25 D. Since we already know that lens power of 4.00 D or greater requires vertexing at each meridian, so we start with 4.00 D = add vertex factor of +0.25 D.
Here it is…įirst of all, just take a look at the simple chart below. Oh, I almost forgot, you don’t need to memorize the vertex formula.
This method works great in a clinical/practical setting when you don’t have a calculator and you need to quickly determine a working contact lens prescription from the patient’s spectacle prescription. During my contact lens rotation, I learned a neat trick to quickly estimate a contact lens prescription that requires vertexing.
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