What is nearsightedness or Myopia?
In medical language nearsightedness, is also known as myopia. In this state person can’t see farther things clearly but he or she can see near things clearly. Myopia is not a disease we can say this an eye focusing disorder. To look clearly refract light reach to a single focus properly but in this condition eye could not do this. This condition creates when the eyeball becomes too big. Myopia or nearsightedness appears in very early age specially 7 years to 15 years child and it also appears in teenagers or old people between 20 to 40 years.
From which units myopia measures is called diopters. Diopter measures optical lens power, a minus sign signify a prescription for myopia, and the numbers signify the degree of myopia
- 0 = normal
- -0.25 to -3.00 diopters = soft nearsightedness
- -3.25 to -6.00 diopters = fair nearsightedness
- -6.25 to -10.00 diopters = serious nearsightedness
- -10.25 diopters or higher = excessive nearsightedness
Symptoms of myopia?
If you are suffering from myopia, you face problem in reading sign board or blackboard and looking problem in far-away objects visibly, but can easily read books without problems. If you driving car or playing games you feels tiredness in this disease. Further symptoms of nearsightedness is Headaches, squinting and eyestrain.
Eye test and exams
A myopia person can read the Jaeger eye chart without problems, but faces difficulty reading the Snellen eye chart. (Jaeger is near eye chart and snellen is distance eye chart)
In general eye test includes this thing:
- Measure pressure of the eye
- To find out the right prescription for eye glasses refraction test is used
- Retinal test
- Examiner or doctor check your color vision, to look for probable color blindness
- Test that eye muscles which move the eyes
- Doctor test your visual acuity, both Snellen and Jaeger
Treatment of nearsightedness?
We have many options to treat nearsightedness
- contact lenses
- laser and other refractive surgery
- vision therapy for whom suffering from stress-related nearsightedness
In myopia doctor normally suggest spectacles because it is not so costly. If you are comfortable with contact lens so, you can also use contact lens. You can permanently get rid of glasses or contact lenses by lasik or refractive surgery. Now a day lasik also called laser-assisted in situ keratomileusis.
Photorefractive keratectomy: To modify cornea shape and refocus light incoming the eye laser process is used. In this process remove a skinny coating of tissue from the surface of the cornea. In this process keep this thing in mind that how much tissue can remove safely and the quantity of myopia that can be corrected.
People who are suffering from extremely myopia or whose corneas are too thin we have one more option ratherthan use laser process. In this process embedding small lenses in their eyes by surgery to accurate myopia. This lens looks like small contact lens and remove spectacles permanently.