Clinical trial NCT00766168: High Refractive Index Material 510(k)
Official title: Prospective Study of Substantial Equivalence of Rigid Gas Permeable HDS HI 1.54™ Daily Wear Lenses for Correction of Naturally Occurring Myopia and Hyperopia From +20 to - 20 D Sphere (Spectacle Plane) With and Without Astigmatism.
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Myopia
Hyperopia
Keywords: contact lens
rigid gas permeable
refractive index
Lead sponsor: CooperVision International Limited (CVIL)
Sponsor class: INDUSTRY
First posted: 2008-10-03
Enrollment: 76
Sex: ALL
Minimum age (years): 12
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: The purpose of this study is to establish the substantial equivalence of the HDS HI 1.54™ to the paflufocon C material control lenses to correct myopia and hyperopia with and without astigmatism. The purpose of the study is to profile the outcome endpoints and the patient acceptance of this Class II medical device.

Detailed description: Seventy six (76) subjects (152 eyes) were enrolled and dispensed in the multisite, randomized, double masked clinical study to provide data that support the presumption of equivalence of the HDS HI 1.54™ investigational lenses to a historical control contact lens. Sixty four (64) subjects (84.2%) completed the study and 12 subjects (15.8%) were discontinued. The population demographics were similar to previous contact lens studies.

Of the ten Test subjects who discontinued, Difficulty Cleaning Lenses (3 subjects) and Poor Comfort (2 subjects), Poor Vision (1 subject) and Poor Vision and Poor Comfort (2 subjects) accounted for 80% of the discontinuations. Two Control subjects discontinued, one for Loss of Interest and one for Poor Comfort There were no adverse events reported during the study. The only study related complications were slit lamp findings of grade 3 for injection. Each of these resolved without complication.

Slit lamp findings were reported at frequencies within expected values and the positive slit lamp observations were primarily grade 1 (trace). Staining and injection were reported most frequently. Subject reports of no symptoms were lowest at the 1 week visit for both the Completed Test and Control eyes and then increased over the remainder of the study. Discomfort was reported most frequently (13.7% of Completed Test eye visits and 12.3% of Completed Control Eye visits). .

Lens comfort was rated as an average of 4.04 (very good) for the Completed Test eyes and 4.07 (very good) for the Completed Control eyes. This compared to a baseline value of 3.96 for the Test eyes and 4.23 for the Control eyes with the pre-study habitual correction.

Keratometry changes were within 1.00 diopter for 93.1% of the Completed Test eyes and 96.4% of the Completed Control eyes. Manifest refraction changes were within 1.00 diopter for 97.9% of the Completed Test eyes and 98.2% of the Completed Control eyes.

One eye of the 63 Completed Test eyes targeted for full distance vision was reported to show a decrease in contact lens visual acuity from the baseline best corrected visual acuity of greater than 0.20 logMAR. The reason for the loss was a reported baseline measurement error. One eye of the 48 Completed Control eyes targeted for full distance vision was reported to show a decrease in contact lens visual acuity from the baseline best corrected visual acuity of greater than 0.20 logMAR. The reason cited for the decrease was lenses being switched eye for eye.

Average lens wearing time was stable at over 13 hours per day for the Completed Test and Control subjects and showed a decrease over time for the discontinued eyes.

Forty nine (49) lens replacements were made for 40 of the 152 eyes dispensed in the study. The replacements were predominantly for deposits (8) or parameter and power change (21) which together account for 59% of the lens replacements. Discomfort was cited for 18.4% (5 test and 4 control lenses) of the lens replacements. Five lenses (10%) were replaced due to loss.

The results of the clinical evaluation of the Paragon HDS HI 1.54™ contact lenses provide evidence of substantial equivalence to the historical control, Paragon Fluroperm® 30 contact lenses.

Eligibility criteria: Inclusion Criteria:

1. Subjects may be male or female, of any race, and at least 12 years old at the time of the pre-treatment examination.
2. The prospective eye(s) must have naturally occurring refractive myopia up to -20.00 D or hyperopia or aphakia up to +20.00 D sphere (spectacle plane), with less than 10.00 D of refractive astigmatism (spectacle plane), as determined by manifest refraction (phoropter or trial frame with a 12.5 mm vertex distance). Subjects must have best spectacle corrected visual acuity of at least 0.30 logMAR (20/40) in each eye.
3. All subjects must be treated bilaterally.
4. Subjects must be willing and capable to return for all scheduled follow-up visits for a period of at least 3 months.

Exclusion Criteria:

1. Female subjects who are pregnant, breast-feeding or intend to become pregnant over the course of the study.
2. Subjects with a history of any of the following medical conditions: collagen vascular disease, autoimmune disease, immunodeficiency diseases, ocular herpes zoster or simplex, endocrine disorders (including, but not limited to active thyroid disorders and diabetes), lupus, and rheumatoid arthritis.

   NOTE: The presence of diabetes (either type 1 or 2), regardless of disease duration, severity or control, will specifically exclude subjects from eligibility.
3. Subjects with a history of intraocular or corneal surgery (excluding cataract extraction and refractive surgery), active ophthalmic disease or abnormality (including, but not limited to, blepharitis, recurrent corneal erosion, dry eye syndrome, neovascularization \> 1mm from limbus), clinically significant lens opacity, clinical evidence of trauma (including scarring), or with evidence of glaucoma or propensity for narrow angle glaucoma as determined by gonioscopic examination in either eye.

   NOTE: This includes any patient with open angle glaucoma, regardless of medication regimen or control. Additionally, any patient with an IOP greater than 21 mm Hg at baseline is specifically excluded from eligibility.
4. Subjects with evidence of keratoconus, corneal irregularity, or abnormal videokeratography in either eye.
5. Subjects who are participating in any other clinical trial (FDA or other).

Primary outcomes:
measure: Best Corrected Visual Acuity vs Control
timeFrame: 3 months
Secondary outcomes:
measure: Incidence of problems , symptoms and complaints vs control
timeFrame: 3 months
measure: slit lamp observations greater than grade 3
timeFrame: 3 months
Other outcomes:
Locations:
city: Lake Elsinore
country: United States
facility: Mission Optometry
state: California
city: Englewood
country: United States
facility: Eyecare Consultants
state: Colorado
city: East Lansing
country: United States
facility: Vision Care Associates
state: Michigan
city: St. Louis
country: United States
facility: Koetting Associates
state: Missouri
city: Rochester
country: United States
facility: Visionary Eye Associates
state: New York
city: Beachwood
country: United States
facility: Western Reserve Vision Care
state: Ohio
city: Goodlettsville
country: United States
facility: Choate Eye Associates
state: Tennessee
city: Federal Way
country: United States
facility: Twin Lakes Vision Clinic
state: Washington
Study officials:
affiliation: Consultant to Paragon Vision Sciences
name: Jerome A. Legerton, OD, MS
role: STUDY_DIRECTOR
References: