The purpose of this study is to evaluate the use of preserved scleral, corneal and amniotic membrane graft for the surgical repair of scleral thinning of different sizes in patients underwent surgery of pterygium with associated beta therapy .

Scleral thinning may occur secondary to different ocular surface conditions, especially in rheumatologic diseases and after surgeries as in pterygium. There are different methods to treat this condition, as to use scleral, corneal and more recently amniotic membrane graft.

Inclusion Criteria:

• Patients with corneal scleral defects that have persisted for 1 years or longer, regardless of their cause. These patients will have received corneal-scleral or amniotic membrane transplant in order to correct scleral thinning
• Patients with history of pterygium surgery associated with beta therapy followed by scleral thinning

Exclusion Criteria:

• Ocular infection
• Acute ocular inflammatory condition
• Previous ocular surgery in the eye study
• Non-controlled systemic disease such as rheumatoid arthritis