Intraocular lens power calculation following LASIK: determination of the new effective index of refraction.

Purpose: To determine the new corneal effective index of refraction (rN) following LASIK to be used for accurate keratometry reading (K-reading).

Methods: A total of 332 eyes that underwent myopic LASIK were divided into two groups (group A [n = 137] and group B [n = 1951). In each group, patients were divided into four subgroups according to the amount of spherical equivalent refraction of myopic LASIK ablation (subgroup 1 [< -4.

Intraocular pressure measurement after hyperopic and myopic LASIK.

Purpose: To assess the effects of hyperopic and myopic laser in situ keratomileusis (LASIK) on the intraocular pressure (IOP) measurement by Goldmann applanation tonometry.

Methods: Intraocular pressure was measured by Goldmann applanation tonometry pre- and postoperatively in 48 hyperopic eyes (26 patients) and 56 myopic eyes (28 patients).

Results: The mean preoperative spherical equivalent refraction was +3.

Effects of different mechanical treatments on nasal resistance assessed by rhinometry.

The goal of this study was to compare the effectiveness of three treatments aiming to reduce nasal airflow resistance (NR): an external nasal strip device (Respir+), an internal nasal mechanical dilator (Nozovent), and a topical decongestant (Pernazène). NR was estimated by active posterior rhinometry at both a 0.5 L/s flow (NRF) and a 1 cm H2O pressure (NRP), under four conditions: in the basal state, with Respir+, with Nozovent, and after treatment with Pernazène.

Nasal airflow resistance measurement: forced oscillation technique versus posterior rhinomanometry.

This study was designed to determine whether nasal airflow resistance (Rn) which is nonlinear during tidal breathing, can be assessed by the forced oscillation (FO) technique. Rn values obtained by the FO technique and extrapolated to 0 Hz (Rn,FO) were compared to those assessed by posterior rhinomanometry at maximal tidal inspiratory flow (Rn,m), at a 0.5 L x s(-1) flow (Rn,F), and at a 1 hPa transnasal pressure (Rn,P).