High-speed videotopographic measurement of tear film build-up time

J. Németh, Béla Erdélyi, Béla Csákány, P. Gáspár, Alexandros Soumelidis, Ferenc Kahlesz, Zsolt Lang

Research output: Contribution to journalArticle

114 Citations (Scopus)

Abstract

PURPOSE. To detect tear film regularity changes in the 15 seconds after a blink, by using a new high-speed videotopographic method. METHODS. The new system, based on a standard corneal topograph, allows registration of four photokeratoscopic images per second. Altogether, 15 eyes of 15 healthy volunteers and 7 eyes of 7 patients with dry eye were examined in this prospective preliminary study. The main outcome measures were changes in surface regularity index (SRI), surface asymmetry index (SAI), and corneal power. RESULTS. The corneal surface became more regular in the first few seconds after a blink. In healthy eyes, the trend line of SRI and SAI decreased (improved) significantly (P <0.001) after a blink, in 10 of 15 eyes for the SRI and in 13 of 15 for the SAI. In the typical cases, the trend line for SRI reached its minimum level, on average, at 7.1 ± 3.9 seconds after a blink and that for the SAI at 5.4 ± 2.7 seconds. Similar trends were found in the dry-eye group. The changes in keratometric measures were small (mean range,

Original languageEnglish
Pages (from-to)1783-1790
Number of pages8
JournalInvestigative Ophthalmology and Visual Science
Volume43
Issue number6
Publication statusPublished - 2002

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Tears
Healthy Volunteers
Outcome Assessment (Health Care)
Prospective Studies

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Németh, J., Erdélyi, B., Csákány, B., Gáspár, P., Soumelidis, A., Kahlesz, F., & Lang, Z. (2002). High-speed videotopographic measurement of tear film build-up time. Investigative Ophthalmology and Visual Science, 43(6), 1783-1790.

High-speed videotopographic measurement of tear film build-up time. / Németh, J.; Erdélyi, Béla; Csákány, Béla; Gáspár, P.; Soumelidis, Alexandros; Kahlesz, Ferenc; Lang, Zsolt.

In: Investigative Ophthalmology and Visual Science, Vol. 43, No. 6, 2002, p. 1783-1790.

Research output: Contribution to journalArticle

Németh, J, Erdélyi, B, Csákány, B, Gáspár, P, Soumelidis, A, Kahlesz, F & Lang, Z 2002, 'High-speed videotopographic measurement of tear film build-up time', Investigative Ophthalmology and Visual Science, vol. 43, no. 6, pp. 1783-1790.
Németh, J. ; Erdélyi, Béla ; Csákány, Béla ; Gáspár, P. ; Soumelidis, Alexandros ; Kahlesz, Ferenc ; Lang, Zsolt. / High-speed videotopographic measurement of tear film build-up time. In: Investigative Ophthalmology and Visual Science. 2002 ; Vol. 43, No. 6. pp. 1783-1790.
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