Clinical Performance Comparison of Two Contact Lenses

• Average Corneal Staining [ Time Frame: 2 weeks ] [ Designated as safety issue: No ]
  The overall score is the average of the total scores of each of five regions of the cornea. The minimum average score is 0 and the maximum average score is 3. Corneal surface abnormality as indicated by the severity of staining over five regions of the cornea (central, superior, inferior, nasal and temporal) was assessed by the investigator using the following scale: 0=none, 1=slight, 2=moderate, 3=severe.
• Visual Acuity [ Time Frame: 2 weeks ] [ Designated as safety issue: No ]
  Visual acuity was assessed by the investigator using the Snellen chart and converted to the logarithm of the minimum angle of resolution (logMAR). logMAR ideal is 0.0 and represents 20/20 Snellen visual acuity. logMAR values > 0.00 indicate vision poorer than the ideal and values <0.00 indicate vision greater than the ideal.
• Overall Comfort [ Time Frame: 2 weeks ] [ Designated as safety issue: No ]
  After two weeks of wear, subjects responded to a phone survey question regarding overall comfort of the study contact lenses (senofilcon A and lotrafilcon B) using the following scale: 5=excellent, 4=very good, 3=good, 2=fair, 1=poor.
• Overall Comfort [ Time Frame: 2 weeks and 4 weeks ] [ Designated as safety issue: No ]
  After four weeks of wear, subjects responded to a phone survey question regarding overall comfort of the study contact lenses (lotrafilcon B)using the following scale: 5=excellent, 4=very good, 3=good, 2=fair, 1=poor.

• corneal staining [ Time Frame: every 2 weeks ] [ Designated as safety issue: No ]
• subjective comfort ratings [ Time Frame: every 2 weeks ] [ Designated as safety issue: No ]
• visual acuity [ Time Frame: every 2 weeks ] [ Designated as safety issue: No ]

• Limbal Redness [ Time Frame: 2 weeks ] [ Designated as safety issue: No ]
  The investigator assessed limbal redness using the following scale: 0=None, 1=Trace, 2=Mild, 3=Moderate, 4=Severe
• Bulbar Redness [ Time Frame: 2 weeks ] [ Designated as safety issue: No ]
  The investigator assessed bulbar redness using the following scale: 0=None, 1=Trace, 2=Mild, 3=Moderate, 4=Severe
• Symptoms of Dryness [ Time Frame: 2 weeks ] [ Designated as safety issue: No ]
  Subjects responded to a phone survey question regarding the frequency of the sensation of dryness while wearing the study contact lenses using the following scale: 1=Extreme, 2=Moderate, 3=Slight, 4=None

The purpose of this study is to compare the clinical performance of two contact lenses.

• Device: senofilcon A
  soft contact lens, 2-week replacement indicated
• Device: lotrafilcon B
  soft contact lens with a 4-week replacement indicated.

• Active Comparator: senofilcon A both eyes
  soft contact lens worn daily for 2 weeks, with a 2-week replacement regimen.
  Intervention: Device: senofilcon A
• Active Comparator: lotrafilcon B both eyes
  soft contact lens worn daily for 4 weeks, with a 4-week replacement regimen
  Intervention: Device: lotrafilcon B

Inclusion Criteria:

• Existing daily soft lens wearer.
• Require a distance visual correction in both eyes.
• Have a contact lens spherical distance refraction between -1.00D and -6.00D.
• Have refractive astigmatism less than or equal to 1.00D in both eyes.
• Achieve 20/30 or better corrected distance acuity.
• Have normal eyes with no evidence of abnormality or disease.

Exclusion Criteria:

• Requires presbyopic correction.
• Requires ocular medications.
• Grade 3 or 4 ocular abnormalities.
• Grade 3 corneal staining in more than one region.
• Has had refractive surgery.
• Any other injury or ocular surgery within 8 weeks prior to study enrollment.
• Has abnormal lacrimal secretions.
• Pre-existing ocular irritation that would preclude contact lens fitting.
• Has keratoconus or other corneal irregularity.
• Polymethyl methacrylate (PMMA), Hybrid or Rigid Gas Permeable (RGP) wear in the previous 8 weeks.
• Wears habitual contact lenses that are toric, multifocal or worn extended wear.
• Any systemic illness which would contraindicate lens wear or the medical treatment of would affect vision or successful lens wear.
• Diabetic.
• Infectious or immunosuppressive disease.
• History of chronic eye disease (e.g glaucoma or age related macular degeneration).
• Pregnancy, lactation or planning pregnancy at time of enrollment.
• Participation in any concurrent clinical trial or in another trial in the last 30 days.