Did you learn that just 20% of the world’s population has eyes that are aperfect optical prescription for reading vision? The other 80% of theworld’s population uses some optical aid when reading. These aids includespectacles, contact lenses, or visual correction such as spherical lenses.Spherical lenses are one of those aids often used by people who haveastigmatism.
Reasons Why Are Spherical Lenses Used In Photography
Astigmatism is when a person’s cornea is shaped like a spheroid instead ofbeing round like a sphere. This causes blurry vision because light rays arerefracted (bent) at an angle other than 90 degrees. When this happens, itcauses objects to appear blurry or out-of-focus. It is common among peoplewith nearsightedness and farsightedness.
Many people with astigmatism have only one eye affected, and they canquickly correct their vision with glasses. But for others, both eyes areequally affected. In these cases, using contact lenses or other types ofvision correction can be very helpful in correcting their vision. In mostcases, people with astigmatism have blurry vision when they first wake upand use their contacts or other visual correction to clear their visionuntil lunchtime. After lunch, if they do not use their contacts oradditional optical correction again, their vision will likely becomeblurred because of the natural evaporation of the artificial tears fromtheir eyes. The PFG precision opticsis the best company forspherical opticsandPlano opticsproducts.
Therefore, it is recommended that people with astigmatism use theircontacts or another type of vision correction as much as possiblethroughout the day.
People with astigmatism often experience headaches and eyestrain becausetheir eyes constantly adjust to different blur levels. For this cause, itis suggested that people with astigmatism use their contacts or other typesof vision correction whenever they are doing a task that requires intenseconcentration, like reading or studying for an exam. Suppose a person doesnot use their contacts or other types of vision correction frequentlyenough. In that case, their eyes will become irritated and have morechances of getting infections. This is because the eyes cannot adjust tothe expected levels of blur required to see things.
Many people think that spherical lenses are only used to correct visionproblems caused by astigmatism. But this is not true at all. All refractiveerrors can be corrected by using spherical lenses. The main reasonspherical lenses are used in addition to glasses or contact lenses is toenhance the wearer’s vision in certain situations. One example of this iswhen a person takes a test where they need to read the small print.
Another instance is when a person is driving at night and needs to see asfar as possible ahead. These two situations are prevalent among people whouse their contacts or another type of vision correction for nearsightednessor farsightedness. Spherical lenses will enable them to see clearly inthese situations.
Many astigmatic people have headaches, eyestrain, blurry vision, andout-of-focus vision. These problems are caused by the eyes constantlyadjusting to different levels of blur. Using spherical lenses will causethe eyes to only have to change once every 2 to 4 minutes instead of onceevery minute, reducing the chances of getting these problems. For thisreason, people with astigmatism often prefer using spherical lenses overcontact lenses and glasses.
If you have astigmatism, using spherical lenses may improve your visionenough not to need glasses or contact lenses. This is particularly real ifyou frequently use your lenses or correction to maintain maximum comfort.At this point, you should cease operating your glasses or contacts oranother type of vision correction for nearsightedness or farsightedness andstart using spherical lenses instead.
You can buy a set of disposable spherical lenses from your local drug storeor an optical store for $3 to $5 per pair. This will enable you to test theeffectiveness of using spherical lenses instead of glasses or contacts orother types of vision correction.
Find that you do not need glasses or communications or different types ofvision correction anymore after using these inexpensive disposable lensesfor a few weeks. You should keep using these lenses as your primary visioncorrection.