RALEIGH, N.C. -- Patients who undergo vision-correcting laser eye surgery sign a release form with an extensive list of risks, but some researchers and former patients say a potential complication is not mentioned: depression that can lead to suicide.In response to patient complaints, the Food and Drug Administration plans to convene a large, national study to examine the relationship of LASIK complications and quality of life, including psychological problems such as depression.Malvina Eydelman, an ophthalmologist with the FDA's Center for Devices and Radiological Health, wrote in an e-mail message that the scant clinical data available “failed to suggest significant problems following LASIK surgery," but she said the FDA wants a broad and systematic review. She wrote, “We also noted that quality of life issues related to LASIK had not been evaluated consistently, and there were few reports of well-designed studies."Frustration and even sorrow can follow any unsuccessful surgery, but when the procedure leaves a patient with unremitting eye pain or permanently impaired vision, the emotional toll can be particularly severe.One who could not endure it was Colin Dorrian, 28, a patent lawyer and aspiring medical student from suburban Philadelphia.