SĂĄdan konverteres Bifocals til Single Vision
Omkring 40 år begynder de fleste at lægge mærke til fint print er vanskeligere at læse, ifølge University of Michigan's Kellogg Eye Center. Bifocals er linser, der har to typer synkorrektion, også kaldet magt: en for afstand og en anden for at hjælpe med at se bedre tæt på. En bifokal recept er omdannet til single vision linser ved enten at kombinere kræfterne i en læse linse eller fjerne læsning del af recepten til single vision fjernlinser.
Konvertering af bifokaler til single vision læsning
Bekendtgør dig med optisk receptprotokol og vilkår. Ohio State University Medical Center bemærker, at hver recept er skrevet med en O.D. (Oculus Dextrous) til højre øje og O.S. (Oculus Sinister) til venstre øje. Nogle recept vil indeholde tal under kategorien Cylinder og Akse for hvert øje, men ikke alle. Bifocals vil altid have et tal skrevet under kategorien ADD eller Addition på en brilleregulering.
Begynd med højre øje. Alle optiske processer starter med O.D. først. Tilføj kraften til kun kuglen eller afstanden i højre øje. For eksempel, hvis recepten er O.D. Sphere +2.00, Cylinder -0.50, Aks 180 med en læsning ADD på -1,00, under konvertering ignorerer du cylinder og akse indtil senere.
Tilføj +2,00 og læsningen ADD på +1,00. Begyndelsen af ​​læseproceduren er nu +3,00. Fortsæt med konverteringen ved at tilføje tilbage i Cylinder og Akse, så O.D. er nu +3,00 Cylinder -0.50 og Aks 180.
Gentag med venstre øje eller O.S. Tilføj læserens receptkraft til venstre afstandsstyrke og hold Cylinder og Aks det samme. Det er muligt at ende med et negativt tal i fjernstyrken. Hvis en persons afstandsforskrift er skrevet som kl. 4,00 og deres ADD er +2,00, beregnes hans læseevne til -2,00. Ifølge opticianworks kan forstørrelsen eller ADD-effekten reduceres minus strøm.
Konvertere Bifokal til Single Vision Distance
Fjern ADD-effekten fra recepten. Dette gøres ved at omskrive receptet som en enkeltvisionsordre.
Bemærk på lab ordreformularen ved siden af ​​bifokal recept, at ordren er SVO, hvilket kun betyder Single Vision eller som DVO, kun for fjernsyn. De fleste laboratorier ved at lave single vision linser fra bifokal recept, hvis bestillingsformularen indeholder instruktioner til DVO.
Markér linserne som SVO, hvis du sender et tidligere slidt bifokalt linser til laboratoriet til enkeltvision. Brug kun en permanent markør, hvis du ikke har til hensigt at genbruge dine bifokale linser i fremtiden. Du skal blot lave en "X" på den bifokale del af linsen eller skrive "SVO" på tværs af hver linse for at advare laboratoriet om, at de nye linser vil blive lavet til single vision.
Tips
Nogle gange tages der hensyn til specifikke situationer, når man konverterer en bifokal recept til læsning eller enkeltbriller. Hvis dit arbejde er i armlængde eller ekstremt tæt, kan linsens styrke justeres. Erfarne licenserede optikere og øjenpleje fagfolk vil normalt hjælpe med at konvertere en recept til lidt eller uden omkostninger.
Advarsler
Resepter til briller må ikke have nogen tal skrevet under Cylinder og Akse eller bare have tallene skrevet til et øje. Cylinder og akse afspejler astigmatisk korrektion, og mange mennesker har ikke korrektionen eller kun har astigmatisme i ét øje.
FAQ - 💬
❓ How do I convert bifocal prescriptions to single vision?
👉 Converting Bifocal to Single Vision Distance Remove the ADD power from the prescription. This is done by rewriting the prescription as a single vision order. Note on the lab order form next to the bifocal prescription that the order is SVO, which means Single Vision Only or as DVO, for Distance Vision Only.
❓ Which is better bifocal or single vision?
👉 Single vision lenses generally help you see clearer at a single distance. Bifocal lenses are split into two sections to accommodate both near and far visual needs, and are ONLY necessary for people who have both of those needs. Traditionally, single vision lenses cost much less than bifocal lenses.
❓ What is the difference between single vision bifocal and progressive?
👉 Unlike single vision, bifocals and progressives are multifocal lenses that have more than one point of focus, such as distance and near. People who have numbers listed for the “ADD” portion of their glasses prescription need either bifocals, progressives, or reading glasses.
❓ What is advantage of bifocal lenses over single vision?
👉 Bifocal lenses correct for two focal distances as opposed to one with single vision lenses. Bifocals feature distance correction up top and better close-up vision at the bottom of the lens, divided by a visible line.
❓ Can I use a progressive prescription for single vision?
👉 But, they have a hidden talent: each one contains multiple prescriptions, or “powers.” If you need separate eye prescriptions to see clearly at different distances, progressive lenses can likely accommodate all of them with a single pair of glasses.
❓ Can bifocals be removed?
👉 If you ever want to take away your safety glasses' prescription capabilities, you can easily remove your bifocal lenses. Use your fingernail to detach the lens from your safety glasses, and then pull the entire lens off.
❓ Can I wear single vision glasses all the time?
👉 Yes, you can wear single vision glasses all the time. They will aid your eyesight to see properly whether for distance or for close reading and can reduce unnecessary eyestrain.
❓ Who should wear single vision lenses?
👉 People under the age of 40 often wear single vision distance glasses to see clearly in the distance and use their eye's natural focusing power to see up close. People over the age of 40 can wear single vision lenses to see clearly in the distance, up close, or at their computer.
❓ Is it better to get bifocal or progressive lenses?
👉 As compared to bifocal lenses, progressives provide a wider zone of clear vision to make activities like computer use and reading easier for the wearer. Early progressive lens designs had a soft blur during movement.
❓ Do I need progressive lenses or single vision?
👉 If you only have a hard time seeing things up close, you might just need reading glasses, which you use whenever you read or use the computer. However, if your vision is blurry enough that you can't see near or far things, a progressive set of lenses might be a better option.
❓ What are the disadvantages of bifocal lenses?
👉 The bifocal glasses present three main disadvantages: the jump of the image when the visual axis passes from the far vision glass to the reading segment, the prismatic effect on the near vision point that entails an apparent displacement of the fixed object as well as a degradation of the quality of its image, and the ...
❓ How do I convert a bifocal prescription to single vision?
👉 Simply make an "X" on the bifocal portion of the lens or write "SVO" across each lens to alert the lab that the new lenses will be made into single vision. Sometimes, specific situations are taken into consideration when converting a bifocal prescription to reading or single glasses.
❓ What are single vision lenses and Bifocal lenses?
👉 Single vision lenses are the most common type of lens found in prescription eyewear. They feature the same prescription across the entirety of the lens surface and can be tailored for distance, mid-range or close up vision. Bifocal lenses are typically distance lenses that include a distinctively cut semi-circle shaped area for close-range vision.
❓ What are bifocals and how do they work?
👉 Bifocals are lenses that have two types of vision correction, also called power: one for distance and another for helping to see better up close. A bifocal prescription is converted to single vision lenses by either combining the powers into a reading lens or removing the reading part of the prescription for single vision distance lenses.
❓ Should I get bifocals or single vision glasses?
👉 Single vision lenses will almost always be less expensive than bifocals, and bifocals will practically always be less expensive than progressive lenses. If you are looking to get into a pair of multifocal glasses as cheap as possible, then we recommend bifocals over progressive lenses.