Precautions for refractive index lens prescription

  Refractive aberration is inevitably combined with other refractive errors, in addition to the clinical manifestations of combined refractive errors, refractive aberration has the following manifestations, such as binocular monovision; alternating vision; amblyopia (monocular vision); strabismus.  Therefore, refractive aberration mainly relies on the correction of the prescription, the prescription should pay attention to the following points: 1, a slight refractive aberration is a very common phenomenon, most people can adapt to wear glasses, no discomfort, some of the first wear visual fatigue symptoms, after a few weeks can gradually get used to.  2, if the refractive aberration of both eyes is obvious, the difference is more than 2.50D (250 degrees), the patient can not adapt to the higher number of eyes for incomplete correction, but should not be reduced too much, otherwise both eyes nearsighted to use a different degree of adjustment, easy to produce visual fatigue symptoms.  3, the adult refractive disparity with amblyopia, if never wearing glasses, can first make its two eyes with the correct corrective lenses in order not to make the refractive error of the higher eye completely useless. Of course, if the patient cannot tolerate it, the lens prescription of the amblyopic eye should be reduced to preserve the effective visual acuity of the eye and prevent the aggravation of amblyopia. For children with refractive error, especially hyperopic refractive error, should be corrected early to avoid the emergence of refractive error amblyopia.  4, children under 12 years of age due to the adjustment, adaptability, generally for the higher number of fully corrected lenses are acceptable.  5, for refractive aberration is too large, can not wear ordinary frame glasses, wearing a corneal contact lens can be effective correction and tolerance.