We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Measurement of the visual axis through two different methods: quantification and differences for measuring chord μ.
- Authors
Felipe Rodrigues, Pablo; Kaplan Moscovici, Bernardo; Lamazales, Luciano; Silva Freitas, Marcela Mara; Pereira Gomes, José Álvaro; Nosé, Walton; Silveira Campos, Mauro
- Abstract
Purpose: To compare the differences between the apparent and actual chord μ. Methods: In this prospective, comparative, non-randomized, and non-interventional study, imaging examinations using Pentacam and the HD Analyzer were performed in the same room under the same scotopic conditions. The inclusion criteria were patients aged 21-71 years, able to provide informed consent, myopia up to 4D, and anterior topographic astigmatism up to 1D. Patients using contact lenses, those with previous eye diseases or surgeries, corneal opacities, corneal tomographic changes, or suspected keratoconus were excluded. Results: Altogether, 116 eyes of 58 patients were analyzed. The patients' mean age was 30.69 (±7.85) years. In the correlation analyses, Pearson's correlation coefficient of 0.647 indicates a moderate positive linear relationship between apparent and actual chord μ. The mean actual and apparent chord μ were 226.21 ± 128.53 and 278.66 ± 123.90 μm, respectively, with a mean difference of 52.45 μm (p=0.01). The analysis of mean pupillary diameter resulted in 5.76 mm using the HD Analyzer and 3.31 mm using the Pentacam. Conclusions: We found a correlation between the two measurement devices, and even though we found considerable differences, both can be used in daily practice. Given their differences, we should respect their peculiarities as well.
- Subjects
ANTERIOR eye segment; PEARSON correlation (Statistics); PUPILLOMETRY; EYE diseases; CORNEAL opacity; CONTACT lenses
- Publication
Arquivos Brasileiros de Oftalmologia, 2024, Vol 87, Issue 4, p1
- ISSN
0004-2749
- Publication type
Article
- DOI
10.5935/0004-2749.2022-0035