Software refraction in the mobilerone for myopia and astigmatism is a novel medical device for myopia adults and elder children with or without astigmatism. And the investigators would like to test its accuracy and efficacy as well as safety.

It's a software installed in a mobilerone with subjective guide on screen for testing myopic refractive error with or without astigmatism for adults or elder children. The investigators would like to compare its refraction results with retinoscopy.

Inclusion Criteria:

• • subject with ametropia on each eye ≤-12.00D

  • subject with best corrected visual acuity ≥ 20/25, no amblyopia
  • subject with normal transparency of eyes
  • subject with a healthy fundus that does not reveal major abnormalities that may affect vision due to the fluctuate situations
  • subject able to cooperate with the screen and the operator
  • subject without heavy drug treatment that may affect vision as synthetic antimalarials, corticosteroids
  • non-diabetic subject
  • non nystagmus subject
  • non-strabismus subject
  • subject who has not had eye surgery less than 1 year old

Exclusion Criteria:

• • subject with a topography showing an anomaly (keratoconus type or other)

  • subject with hyperopia or presbyopia
  • subject with mild myopia ≥ -1.00D
  • subject who cannot speak with the operator including those staff of local optometrists or ophthalmologists