Cling film as a barrier against CJD in Goldmann-type applanation tonometry

Leon N. Davies, Hannah E. Bartlett, Mark C.M. Dunne*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Purpose: To determine the feasibility of taking intra-ocular pressure (IOP) readings with Goldmann-type applanation tonometer probe covered with cling film to avoid transmission of Creutzfeldt-Jakob disease (CJD). Methods: Data were collected on two occasions from the right eyes of 30 healthy subjects using a Perkins applanation tonometer. On each occasion, a single tonometry measurement was made with and without cling film covering. Results: Cling film covering brought about a statistically significant IOP bias (-0.8 mmHg on first occasion and -1.17 mmHg on second occasion). The 95% limits of agreement, between readings made with and without cling film covering, were ±3.4 mmHg on first occasion; ±2.5 mmHg on second occasion. A statistically significant reduction of inter-sessional repeatability was observed for readings taken with cling film (±5.2 mmHg) compared to those made without (±3.9 mmHg). Conclusions: Even if the above findings are found to be acceptable, given the known intra-subject variations of this type of tonometry (±4 mmHg), ethical and legal considerations relating to the barrier properties of cling film are likely to prevent its routine use by optometrists. © 2004 The College of Optometrists.

Original languageEnglish
Pages (from-to)27-34
Number of pages8
JournalOphthalmic and Physiological Optics
Issue number1
Publication statusPublished - Jan 2004


  • cling film
  • Creutzfeldt-Jakob disease
  • Goldmann-type applanation tonometry


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