Tear Deformation Time and optical quality in eyes wearing silicone hydrogel contact lenses.
OBJECTIVE
To evaluate tear film stability and optical aberrations in eyes wearing plano Lotrafilcon B contact lenses (CL).


METHODS
Tear Deformation Time (TDT) and aberrometric parameters were assessed in 86 normal emmetropic eyes before and 6 h after wearing CL.


RESULTS
A statistically significant decrease in TDT and increase in root mean square (RMS) values of higher order aberrations (HOA) were revealed 6 h after CL insertion (both P < 0.001). The low order aberrations (LOA) RMS values measured with CL were higher than those in naked eyes, but the difference was not statistically significant. None of individual Zernike polynomials showed any significant alteration.


CONCLUSIONS
Our findings indicated that the Lotrafilcon B contact lens affects HOA more than LOA. The tear film was less stable after wearing CL.
Optometry Department, Mashhad University of Medical Sciences, Mashhad, Iran; Optometry Department, Iran University of Medical Sciences, Tehran, Iran.
Amir
A
Asharlous
Noor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran.
Ebrahim
E
Jafarzadehpur
Optometry Department, Iran University of Medical Sciences, Tehran, Iran.
Ali
A
Mirzajani
Department of Medical Surgical Nursing, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Mehdi
M
Khabazkhoob
Department of Optometry, School of Paramedical Science, Mashhad University of Medical Science, Mashhad, Iran.
Samira
S
Heydarian
Department of Epidemiology & Research Methodology, Faculty of Health, Mashhad University of Medical Sciences, Mashhad, Iran.
Ali
A
Taghipour
Aberrations; Optical quality; Silicone hydrogel contact lens; Tear Deformation Time; Tear stability