title: Shape of the myopic eye as seen with high-resolution magnetic resonance imaging.
abstract: We have obtained multislice magnetic resonance (MR) images of the eye and calculated ocular dimensions along the three cardinal axes: antero-posterior (A-P), equatorial, and vertical. We found no difference in the shape of hyperopic (average refractive error: +3.72 D) and emmetropic eyes, both of which had an equatorial diameter longer than the A-P and vertical diameters. Myopic eyes (average refractive error: -6.54 D) were larger than hyperopic eyes, and most had the same spheroelliptical shape as that of the emmetropic and hyperopic eyes. The results suggest that during myopic progression an overall enlargement or a radial volume expansion has occurred.
authors.affiliation: Howe Laboratory of Ophthalmology, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston.
authors.forename: H M
authors.initials: HM
authors.lastname: Cheng
authors.forename: O S
authors.initials: OS
authors.lastname: Singh
authors.forename: K K
authors.initials: KK
authors.lastname: Kwong
authors.forename: J
authors.initials: J
authors.lastname: Xiong
authors.forename: B T
authors.initials: BT
authors.lastname: Woods
authors.forename: T J
authors.initials: TJ
authors.lastname: Brady
mesh_terms: D000328:Adult; D000368:Aged; D001699:Biometry; D002829:Choroid / Q000473:pathology; D005123:Eye / Q000473:pathology*; D006801:Humans; D006956:Hyperopia / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D009216:Myopia / Q000473:pathology*