Chemical Analyzer (Roche).Author ContributionsConceived and designed the experiments: YML HH. Performed the experiments: JYC LF HLZ JCL XWY LL XLC HYQ. Analyzed the data: 
JYC HH. Contributed reagents/materials/analysis tools: YML. Wrote the paper: JYC HH.Notch Regulates EEPCs and EOCs Differentially
Acid Yellow 23 web diseases of the posterior segment of the eye are responsible for severe vision loss and blindness in the developed countries. The most prevalent posterior segment diseases include age related macular degeneration (AMD), diabetic retinopathy, and retinal degenerative diseases. As of 2008, AMD is prevalent in 8 million in the USA and is expected to increase to 12 million by 2020 [1]. Nearly 10 of the subjects suffering from AMD are diagnosed with the growth of abnormal or leaky blood vessels in the choroid below the retina, a condition known as wet AMD or choroidal neovascularization (CNV). CNV is primarily responsible for significant loss of vision and blindness in AMD patients. Diabetic retinopathy is prevalent in 4.1 million people in the United States, with nearly 22 (0.9 million) of diabetic patients having visionthreatening diabetic retinopathy [2]. Further, the number of diabetic patients in the USA is expected to rise to 16 million by 2050 [2]. Increase in prevalence of these vision threatening disorders is also resulting in a rise in the cost of treatment [3]. Despite the severity and increasing prevalence of back of the eye diseases, conventional drug delivery methods are either inefficient in delivering required amount of drug to the site of action or highly invasive to the vitreous humor, with significant side effects. The most common drug delivery method for treating ocular disorders is topical administration, primarily due to its convenience. Unfortunately, topically administered treatments are rapidly drained from the ocular surface, resulting in less than 5 bioavailability, that too mainly to the tissues in the anterior segment of the eye [4]. Due to the barriers present, currently there is no eye drop formulation approved for treating back of the eyeSuprachoroidal Drug Deliverydiseases. To bypass the barriers associated with topical delivery for back of the eye diseases, intravitreal injections are becoming popular [5,6]. However, intravitreal injections are highly invasive and associated with complications such as cataract, retinal detachment, vitreous hemorrhage, and endophthalmitis [7]. Other than topical and intravitreal routes of delivery, periocular routes such as sub-Tenon and subconjunctival routes can also be used to deliver drugs to the posterior segment of the eye [8,9]. The periocular routes place the therapeutic agent adjacent to the sclera for transscleral delivery, thereby reducing the risks associated with the intravitreal route of 1527786 administration [10]. Nevertheless, periocular routes have disadvantages such as hemorrhage at the site of injection [11,12]. Thus, development of a safe and efficacious route of delivery for the treatment of posterior segment disorders remains the 374913-63-0 foremost challenge in ocular drug delivery research. Suprachoroidal space (SCS) [13] is a unique, anatomically advantageous space that localizes therapeutic agents adjacent to the choroid-retina region, the target tissue affected in the neovacular form of age related macular degeneration and diabetic retinopathy. Safety of injections into the SCS was shown by Einmahl et al. [14], wherein a novel poly (ortho ester) biomaterial was evaluate.Chemical Analyzer (Roche).Author ContributionsConceived and designed the experiments: YML HH. Performed 
the experiments: JYC LF HLZ JCL XWY LL XLC HYQ. Analyzed the data: JYC HH. Contributed reagents/materials/analysis tools: YML. Wrote the paper: JYC HH.Notch Regulates EEPCs and EOCs Differentially
Diseases of the posterior segment of the eye are responsible for severe vision loss and blindness in the developed countries. The most prevalent posterior segment diseases include age related macular degeneration (AMD), diabetic retinopathy, and retinal degenerative diseases. As of 2008, AMD is prevalent in 8 million in the USA and is expected to increase to 12 million by 2020 [1]. Nearly 10 of the subjects suffering from AMD are diagnosed with the growth of abnormal or leaky blood vessels in the choroid below the retina, a condition known as wet AMD or choroidal neovascularization (CNV). CNV is primarily responsible for significant loss of vision and blindness in AMD patients. Diabetic retinopathy is prevalent in 4.1 million people in the United States, with nearly 22 (0.9 million) of diabetic patients having visionthreatening diabetic retinopathy [2]. Further, the number of diabetic patients in the USA is expected to rise to 16 million by 2050 [2]. Increase in prevalence of these vision threatening disorders is also resulting in a rise in the cost of treatment [3]. Despite the severity and increasing prevalence of back of the eye diseases, conventional drug delivery methods are either inefficient in delivering required amount of drug to the site of action or highly invasive to the vitreous humor, with significant side effects. The most common drug delivery method for treating ocular disorders is topical administration, primarily due to its convenience. Unfortunately, topically administered treatments are rapidly drained from the ocular surface, resulting in less than 5 bioavailability, that too mainly to the tissues in the anterior segment of the eye [4]. Due to the barriers present, currently there is no eye drop formulation approved for treating back of the eyeSuprachoroidal Drug Deliverydiseases. To bypass the barriers associated with topical delivery for back of the eye diseases, intravitreal injections are becoming popular [5,6]. However, intravitreal injections are highly invasive and associated with complications such as cataract, retinal detachment, vitreous hemorrhage, and endophthalmitis [7]. Other than topical and intravitreal routes of delivery, periocular routes such as sub-Tenon and subconjunctival routes can also be used to deliver drugs to the posterior segment of the eye [8,9]. The periocular routes place the therapeutic agent adjacent to the sclera for transscleral delivery, thereby reducing the risks associated with the intravitreal route of 1527786 administration [10]. Nevertheless, periocular routes have disadvantages such as hemorrhage at the site of injection [11,12]. Thus, development of a safe and efficacious route of delivery for the treatment of posterior segment disorders remains the foremost challenge in ocular drug delivery research. Suprachoroidal space (SCS) [13] is a unique, anatomically advantageous space that localizes therapeutic agents adjacent to the choroid-retina region, the target tissue affected in the neovacular form of age related macular degeneration and diabetic retinopathy. Safety of injections into the SCS was shown by Einmahl et al. [14], wherein a novel poly (ortho ester) biomaterial was evaluate.