Table 2. Equipment-induced myopization in the preterm group, with the two marginal SER refractive groups specified: hyperopia ≥+2.5 D and negative refraction (myopia).

Group	Equipment-induced myopization (D)
	Mean value (SD)	Median value	Range
PT myopes (16 eyes)	1.22 (0.95)	1.15	0–3.88
PT central (285 eyes)	1.83 (1.05)	1.5	0–6.89
PT hyperopes (47 eyes)	2.54 (1.25)	2.5	0–6.37

Abbreviations: PT, preterm; SD, standard deviation; SER, spherical equivalent refraction.