February 1999
Volume 40, Issue 2
Free
Articles  |   February 1999
Agreement between grating acuity at age 1 year and Snellen acuity at age 5.5 years in the preterm child. Cryotherapy for Retinopathy of Prematurity Cooperative Group.
Author Affiliations
  • V Dobson
    Department of Ophthalmology, University of Arizona, Tucson 85719-3758, USA.
  • G E Quinn
    Department of Ophthalmology, University of Arizona, Tucson 85719-3758, USA.
  • R M Siatkowski
    Department of Ophthalmology, University of Arizona, Tucson 85719-3758, USA.
  • J D Baker
    Department of Ophthalmology, University of Arizona, Tucson 85719-3758, USA.
  • R J Hardy
    Department of Ophthalmology, University of Arizona, Tucson 85719-3758, USA.
  • J D Reynolds
    Department of Ophthalmology, University of Arizona, Tucson 85719-3758, USA.
  • M T Trese
    Department of Ophthalmology, University of Arizona, Tucson 85719-3758, USA.
  • B Tung
    Department of Ophthalmology, University of Arizona, Tucson 85719-3758, USA.
Investigative Ophthalmology & Visual Science February 1999, Vol.40, 496-503. doi:
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    • Get Citation

      V Dobson, G E Quinn, R M Siatkowski, J D Baker, R J Hardy, J D Reynolds, M T Trese, B Tung; Agreement between grating acuity at age 1 year and Snellen acuity at age 5.5 years in the preterm child. Cryotherapy for Retinopathy of Prematurity Cooperative Group.. Invest. Ophthalmol. Vis. Sci. 1999;40(2):496-503.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

PURPOSE: To examine the relation between grating acuity at age 1 year and Snellen acuity and grating acuity at 5.5 years, in preterm children with birth weights less than 1251 g. METHODS: Subjects were participants in the multicenter study of Cryotherapy for Retinopathy of Prematurity. The Teller acuity card (TAC; Vistech Consultants, Dayton, OH) procedure was used to measure monocular grating acuity in children at ages 1 and 5.5 years. Early-treatment diabetic retinopathy study (ETDRS) charts were used to measure the childrens' monocular recognition (Snellen) acuity at age 5.5 years. Data are presented for 575 eyes with measurable TAC grating acuity at 1 year and 111 eyes that had no measurable acuity at 1 year. RESULTS: Among eyes with normal acuity at 1 year, 86.8% showed normal Snellen acuity, and 94.3% showed normal grating acuity at 5.5 years. Among eyes that were blind (i.e., had no measurable TAC grating acuity) at 1 year, 96.8% showed no quantifiable Snellen acuity, and 89.2% showed no quantifiable grating acuity at 5.5 years. Only 2.4% of eyes had acuity in the range between normal and blind at 1 year (i.e., measurable grating acuity <1.6 cyc/deg); thus, the predictive value of acuity scores in this range could not be determined. Correlation analysis indicated that the relative position within the normal range of an eye's grating acuity score at 1 year was not predictive of the relative position within the normal range of that eye's acuity score at 5.5 years. CONCLUSIONS: Among a large population of low-birth-weight infants, eyes with normal grating acuity at age 1 year generally showed normal Snellen and grating acuity at age 5.5 years, and eyes that had no quantifiable acuity at 1 year remained blind at 5.5 years. Relative position of an eye's acuity score within the normal range was not predictive of the relative position of that eye's later acuity score.

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