How Understanding Your Prescription Can Save You Hundreds Of Dollars On Eyeglass Purchases
Website design By BotEap.comBy having a basic understanding of your prescription, you’ll be able to shop smarter and save hundreds of dollars in the process.
Website design By BotEap.comNearsightedness or nearsightedness are people who have trouble focusing on distant objects. Opticians use what they call a negative lens to correct myopia. Negative lenses are characterized by being thick at the edge of the lens and thin in the center.
Website design By BotEap.comFarsightedness or farsightedness are those who have trouble focusing on close objects. Opticians use a plus lens to correct farsightedness. Plus lenses are thick in the center and thin at the edge.
Website design By BotEap.comPresbyopia or “vision of the elderly” in Greek usually occurs after the age of forty, when the eye muscles lose their power to accommodate objects at close distances.
Website design By BotEap.comPatients with presbyopia are those who need both distance and near correction. Bifocal lenses are used to correct this type of eye condition.
Website design By BotEap.comRecipes are usually written in this format:
Website design By BotEap.comspherical cylindrical shaft
Website design By BotEap.comOD -3.25 -1.00 180
Website design By BotEap.comSO +0.25 -1.25 85
Website design By BotEap.comADD +2.25
Website design By BotEap.comThe above prescription is for someone who is presbyopic.
Website design By BotEap.comOD or Oculus Dexter is Latin for right eye and OS or Oculus Sinister is Latin for left eye. DV is far vision and NV is near vision. Add refers to the correction needed for reading.
Website design By BotEap.comThe first set of numbers or the round numbers represent the necessary correction for distance, or the power that the lens must have, in order for you to see objects in the distance correctly.
Website design By BotEap.comThe second part or the correct cylindrical value for astigmatism. Astigmatism occurs when the cornea is shaped more like a soccer ball than a basketball.
Website design By BotEap.comBecause the eye rotates on an axis of 180 degrees, the axis portion of the prescription represents the meridian where correction is needed.
Website design By BotEap.comEyeglass lenses are made from one of three materials; they are all made of plastic with what they call different indices. Basically, the higher the index, the thinner the material.
Website design By BotEap.comCR39 or basic plastic is 1.498, poly is 1.586, and high-index comes in a few different flavors, with index ratios between 1.53 and 1.74. The higher the index, the thinner, lighter, and more expensive the lenses are.
Website design By BotEap.comPolycarbonate is good for safety, while the high index is recommended for someone with a high prescription, like -5.00 or higher. If you have a very thick prescription, polycarbonate or high index is thinner and is the recommended material for you.
Website design By BotEap.comCR-39 or plastic, meanwhile, is good for someone who just needs basic glasses for reading or distance vision, but doesn’t want to spend a lot. It’s for someone with a low prescription. Cr-39 has excellent optics, but is thicker than polycarbonate. It’s good for someone with prescriptions that are between +2.25 and -3.00. Also good for a backup pair. However, I would not recommend it for someone who needs security.
Website design By BotEap.comPolycarbonate is the recommended lens for those who need security. It is ideal for children and those involved in impact sports and those who need safety glasses in the workplace. Polycarbonate can be up to 40% thinner and 30% lighter than plastic
Website design By BotEap.comHigh Index are the recommended lenses for those with higher prescriptions. It is the best lens if you want the thinnest, lightest lens available. Like polycarbonate, they provide 100% protection against harmful UV rays. The AR coating gives them the best optical performance and appearance. Prescriptions that are -3.00 to +3.00 and up will look much thinner in high index lenses.
Website design By BotEap.comAnti-reflective coatings help reduce unwanted reflections and help alleviate glare and eye strain from monitors, and glare from oncoming traffic when driving at night.
Website design By BotEap.comUltraviolet (UV) protection also helps the eyes against harmful radiation.
Website design By BotEap.comPrescription sunglasses also protect the eyes from harmful radiation while correcting vision.
Website design By BotEap.comThose who prefer to wear just one pair indoors and outdoors can opt for photochromic lenses that change to sunglasses outdoors and back to clear indoors.