Five-year refractive changes in a rural Chinese adult population and its related factors: the Handan Eye Study.

There was a myopic shift for those 30-39 years old and a hyperopic shift from 40 to 69 years old in a rural Chinese adult population. Those with severe nuclear opacity, longer axil length, diabetes and large change of lens power tended to have a myopic shift, while those being older and having ocular hypertension at baseline were prone to have a hyperopic shift. There was also an increase in against-the-rule astigmatism in this population.