Astigmatism
Conditions
Keywords
toric contact lens, rotational stability, lens rotation, stabilization design, ocular biometry, soft contact lens
Brief summary
This study compared the rotational behavior of two commercially available soft toric contact lenses with different stabilization designs and explored whether ocular biometric and refractive characteristics were associated with lens rotation. Contact lens-naïve adults underwent baseline ocular biometry and were scheduled for two separate lens-fitting sessions in randomized order. Lens rotation was measured 30 minutes after insertion in primary, right, left, upward, and downward gaze using slit-lamp biomicroscopy. The study was designed as a two-period crossover comparison.
Interventions
DEVICEAcuvue Oasys for Astigmatism
Commercially available soft toric contact lens composed of senofilcon A, with an 8.6-mm base curve and 14.5-mm diameter, using an accelerated stabilization design.
DEVICEAir Optix for Astigmatism
Commercially available soft toric contact lens composed of lotrafilcon B, with an 8.7-mm base curve and 14.5-mm diameter, using a modified periballast stabilization design.
Sponsors
Bozok University
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
OTHER
Masking
NONE
Intervention model description
Participants were scheduled to receive both soft toric contact lens designs in two separate fitting sessions, with the order of lens application randomized by a simple draw of lots. The two sessions were separated by a 4-day interval. Because 16 participants did not attend the second session, the intended two-period crossover design was incomplete.
Eligibility
Sex/Gender
ALL
Age
18 Years to 50 Years
Healthy volunteers
No
Inclusion criteria
* Adults with astigmatic refractive error suitable for correction with the -commercially available toric contact lenses used in the study * No prior experience with contact lens wear * Healthy ocular surface examination * Ability and willingness to provide written informed consent
Exclusion criteria
* History of corneal pathology * Previous ocular surgery * Active ocular disease * Systemic disease affecting the eyes
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Overall Mean Absolute Contact Lens Rotation | 30 minutes after lens insertion during each fitting session | Absolute lens rotation was measured in degrees using slit-lamp biomicroscopy in five gaze positions (primary, right, left, upward, and downward gaze). For each lens design, the overall mean absolute rotation was calculated as the average of the absolute rotation measurements across the five gaze positions. |
Countries
Turkey (Türkiye)
Outcome results
None listed