The purpose of this study is to evaluate the Plasma Pharmacokinetics and Safety of AC 170 0.24% in Healthy, Adult Subjects when used twice daily for one week.

Inclusion Criteria:

• at least 18 and no older than 55 years of age
• be able to self-administer eye drops or have a parent/legal guardian available for this purpose
• have blood and urine analysis within normal limits
• have ocular health within normal limits

Exclusion Criteria:

• known contraindications or sensitivities to the study medication or its components
• have any active systemic or ocular disorder (other than refractive disorder)
• have inability to comply with controlled diet
• have used prescription or non prescription drugs within washout period and throughout study
• have used alcohol or tobacco within the washout period