Occupational Bifocals and Trifocals
Occupational Bifocals and Trifocals
An occupational lens is a type of multifocal that is specifically suited for performing a particular job or hobby. Glasses with these lenses are special-purpose eyewear and are not designed for everyday wear. By strategically placing the near, intermediate and far vision zones on certain areas of the lens, specific visual tasks are made easier.
The Double-D Bifocal: For Reading and Overhead Near Work
The Double-D is an occupational bifocal that consists of a D-shaped flat-top bifocal at the bottom of the lens and an upside-down flat-top near segment located at the top of the lens. The rest of the lens area consists of distance correction.
People in occupations such as auto maintenance and repair can benefit from a Double-D occupational bifocal. This design allows workers to be able to see well up-close, both when looking down and when looking up to work on the undercarriage of a car on a lift. Mail clerks and others who read documents and may need to file them overhead might also find this lens useful at work.
The E-D Trifocal: For When You Need to See Everywhere, but Especially at Arm’s Length
The E-D trifocal has the distance correction in the top half of the lens and an intermediate correction for vision at arm’s length in the bottom half of the lens. The line separating these two zones extends across the entire width of the lens, like an Executive bifocal. But in the E-D trifocal, a small D-shaped segment for near vision is embedded within the intermediate zone.
The E-D trifocal is an excellent choice for someone who needs a wide field of view at arm’s length, but also needs to see clearly close up and in the distance. A television production person, who must keep an eye on several TV monitors while being able to read notes from a clipboard and recognize someone across the room, would be a good candidate for this lens.
Need to Read All Day at Work?
Sometimes, a common multifocal can become an occupational lens simply by changing the position of the intermediate or near segment or the characteristics of the progressive design.
For example, if your job requires you to read most of the day, you may want to consider a separate pair of glasses for work that have the bifocal or trifocal segments placed higher than normal in the lens. This would enable you to read or use your computer for extended periods without having to tip your head back in an uncomfortable posture.
Or you may want to try an “office” progressive lens, which has a larger, wider intermediate zone for computer use and a smaller zone for distance vision. These occupational lenses give you more usable vision for your computer and desk work, yet still provide adequate distance vision for spotting people across the room. However, because the distance zone of occupational progressive lenses is limited, they’re not suitable for driving or for other tasks that require a wide field of view in the distance.
What About on the Golf Course?
If you’re a golfer and wear multifocal lenses, you know these lenses can be a problem on the course. The near vision zones of bifocal, trifocal and progressive lenses can interfere with your view of the ball, requiring you to tilt your head down in an uncomfortable posture. Everyday multifocals can also make lining up a putt much more difficult.
The solution? Consider trying an occupational multifocal commonly called a “golfer’s bifocal.” The small (usually round) near segment is placed very low and in the outside corner of just one lens, so it’s completely out of the way when you address your ball or line up a putt. But it still gives you enough near vision to read your scorecard or browse a menu for lunch in the clubhouse.
Customized Eyewear Solutions
Nearly all adults – especially anyone over age 40 who needs multifocal lenses – can benefit from having more than one pair of eyeglasses, with the second pair having an occupational design.
Lens ya Bifocal na Trifocal ya Kazi: Lens ya Bifocal na Trifocal ya Kazi ni aina ya lensi ya multifocal ambayo inafaa hasa kwa kufanya kazi fulani au burudani. Miwani yenye lensi hizo ni miwani ya kusudi la pekee na haikusudiwi kuvaliwa kila siku. Kwa kuweka kwa njia ya kimkakati maeneo ya kuona ya karibu, ya kati na ya mbali kwenye maeneo fulani ya lensi, kazi maalum za kuona hufanya iwe rahisi. Double-D Bifocal: Kwa ajili ya kusoma na kazi ya juu karibu na kazi ya juu ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi ya kazi. Sehemu iliyobaki ya eneo la lensi inajumuisha marekebisho ya umbali. Watu katika kazi kama vile matengenezo ya magari na ukarabati wanaweza kufaidika na kazi ya Double-D bifocal. Hii inawawezesha wafanyakazi kuona vizuri karibu, wakati wa kuangalia chini na wakati wa kuangalia juu kufanya kazi kwenye undercarriage ya gari juu ya lifti. Waandishi wa barua na wengine ambao husoma hati na huenda wakahitaji kuziweka juu ya kichwa wanaweza pia kupata lensi hii kuwa yenye manufaa kazini. Trifocal: Kwa wakati unahitaji kuona kila mahali, lakini hasa kwa urefu wa mkono, trifocal ina marekebisho ya umbali katika nusu ya juu ya lensi na marekebisho ya kati kwa maono kwa urefu wa mkono katika nusu ya chini ya lensi. Mstari unaotenganisha maeneo haya mawili unaenea katika upana wote wa lensi, kama bifocal ya Mtendaji. Lakini katika E-D trifocal, sehemu ndogo ya umbo la D kwa ajili ya kuona karibu imeingizwa ndani ya eneo la kati. E-D trifocal ni chaguo bora kwa mtu ambaye anahitaji uwanja mpana wa kuona kwa urefu wa mkono, lakini pia anahitaji kuona wazi karibu na kwa mbali. Mtu wa uzalishaji wa televisheni, ambaye lazima awe na jicho kwenye skrini kadhaa za televisheni wakati wa kuweza kusoma maelezo kutoka kwa ubao wa clipboard na kutambua mtu katika chumba, angekuwa mgombea mzuri kwa lensi hii. Je, Unahitaji Kusoma Siku Yote kazini? Wakati mwingine, multifocal kawaida inaweza kuwa lensi ya kazi kwa kubadilisha tu nafasi ya sehemu ya kati au karibu au sifa za muundo wa maendeleo. Kwa mfano, ikiwa kazi yako inakuomba usome zaidi ya siku, unaweza kufikiria kutumia miwani tofauti ya kazi ambayo ina sehemu za bifocal au trifocal zilizo juu kuliko kawaida katika lensi. Hii itakusaidia kusoma au kutumia kompyuta kwa muda mrefu bila kuelekeza kichwa chako nyuma katika nafasi isiyofaa. Au unaweza kujaribu lensi ya "office" inayoendelea, ambayo ina eneo kubwa, pana la kati kwa ajili ya matumizi ya kompyuta na eneo dogo kwa ajili ya kuona mbali. Lens hizi za kazi zinakupa maono mazuri zaidi kwa kazi yako ya kompyuta na dawati, lakini bado hutoa maono ya kutosha ya umbali kwa watu wa nje ya chumba. Hata hivyo, kwa sababu eneo la umbali wa lensi za kazi za maendeleo ni mdogo, hazifai kwa ajili ya kuendesha gari au kwa ajili ya kazi nyingine ambazo zinahitaji uwanja mpana wa kuona kwa mbali. Namna gani kuhusu uwanja wa gofu? Kama wewe ni mchezaji wa gofu na kuvaa lensi multifocal, unajua lensi hizi inaweza kuwa tatizo juu ya kozi. Lens za karibu za bifocal, trifocal na progressive zinaweza kuingilia kati na mtazamo wako wa mpira, kukuhitaji kuelekeza kichwa chako chini katika msimamo usiofaa. Vioo vya kila siku vinavyoweza kuelekeza macho vingi vinaweza pia kufanya iwe vigumu zaidi kupiga mpira. Suluhisho? Kwa mfano, kwa mfano, unaweza kutumia kifaa cha multifocal cha kazi, kinachoitwa bifocal ya golfer, ambacho ni sehemu ndogo ya karibu na iko chini sana na kwenye kona ya nje ya lensi moja tu, kwa hivyo ni mbali kabisa wakati unashughulikia mpira wako au kuweka mstari. Lakini bado inatoa maono ya karibu ya kutosha kusoma kadi yako ya alama au kuvinjari orodha ya chakula cha mchana katika klabu. Kwa mfano, watu wazima wote, hasa wale wenye umri wa zaidi ya miaka 40, ambao wanahitaji lensi nyingi, wanaweza kufaidika na kuwa na zaidi ya jozi moja ya miwani, na jozi ya pili kuwa na muundo wa kazi.