The visual status of adolescents in Riyadh, Saudi Arabia: a population study

Figures & data

Table 1 Definitions of the criteria used for outcomes cutoff

Variables	Definitions
Myopia	Spherical equivalent refractive error ≤ −0.50 D in one or both eyes
Hyperopia	Spherical equivalent refractive error ≥ +2.00 D in one or both eyes
Astigmatism	Cylinder power ≥ 0.75 DC if one or both eyes were astigmatic
Emmetropia	When neither eye was myopic or hyperopic.
Unilateral amblyopia	Interocular difference in the best-corrected VA of 2 lines or more on the chart.
Bilateral amblyopia	When the best-corrected binocular VA was abnormal, even after full refractive correction.
Correctable visual impairment	Defined as a reduction of the VA of ≥ 0.30 logMAR (6/12), when VA improvement of 2 or more lines was achieved.^Citation27

Abbreviation: VA, visual acuity.

Table 2 Types, frequencies, and severities of the RE of the participants

RE	Mild (RE ≤3 D)	Moderate (3 D < RE ≤6 D)	High (RE >6 D)
Myopia	422 (47.90%)	98 (9.8%)	13 (1.3%)
Hyperopia	14 (1.40%)	7 (0.7%)	0
Astigmatism	143 (14.3%)	7 (0.70%)	0

Abbreviations: D, diopters; RE, refractive error.

HeMGXuJJYinQXEllweinLBNeed and challenges of refractive correction in urban Chinese school childrenOptom Vis Sci20058222923415829844

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