Accuracy and validity of IK4 handheld video keratometer measurements in children

Erin M. Harvey; Joseph M. Miller; Jim Schwiegerling; Candice E. Clifford-Donaldson; Tina K. Green; Dawn H. Messer; Velma Dobson

doi:10.1016/j.jaapos.2011.04.002

Accuracy and validity of IK4 handheld video keratometer measurements in children

Erin M. Harvey, Joseph M. Miller, Jim Schwiegerling, Candice E. Clifford-Donaldson, Tina K. Green, Dawn H. Messer, Velma Dobson

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The infant keratometer (IK4) is a custom handheld instrument that was designed specifically to allow measurement of corneal astigmatism in infants as young as 6 months of age. In this study, accuracy of IK4 measurements with the use of standard toric surfaces was within 0.25 D. Validity measurements obtained in 860 children aged 3-7 years demonstrated slightly greater astigmatism measurements in the IK4 than in the Retinomax K+. Measurement success was 98% when the IK4 was used. The IK4 may prove to be clinically useful for screening children as young as 3 years of age at high risk for corneal astigmatism.

Original language	English (US)
Pages (from-to)	407-409
Number of pages	3
Journal	Journal of AAPOS
Volume	15
Issue number	4
DOIs	https://doi.org/10.1016/j.jaapos.2011.04.002
State	Published - Aug 2011

ASJC Scopus subject areas

Pediatrics, Perinatology, and Child Health
Ophthalmology

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10.1016/j.jaapos.2011.04.002

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title = "Accuracy and validity of IK4 handheld video keratometer measurements in children",

abstract = "The infant keratometer (IK4) is a custom handheld instrument that was designed specifically to allow measurement of corneal astigmatism in infants as young as 6 months of age. In this study, accuracy of IK4 measurements with the use of standard toric surfaces was within 0.25 D. Validity measurements obtained in 860 children aged 3-7 years demonstrated slightly greater astigmatism measurements in the IK4 than in the Retinomax K+. Measurement success was 98% when the IK4 was used. The IK4 may prove to be clinically useful for screening children as young as 3 years of age at high risk for corneal astigmatism.",

author = "Harvey, {Erin M.} and Miller, {Joseph M.} and Jim Schwiegerling and Clifford-Donaldson, {Candice E.} and Green, {Tina K.} and Messer, {Dawn H.} and Velma Dobson",

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AU - Miller, Joseph M.

AU - Schwiegerling, Jim

AU - Clifford-Donaldson, Candice E.

AU - Green, Tina K.

AU - Messer, Dawn H.

AU - Dobson, Velma

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Accuracy and validity of IK4 handheld video keratometer measurements in children

Abstract

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