In addition to performing comprehensive medical and vision examinations for glasses and contact lenses, ophthalmologists diagnose and treat various diseases and conditions of the eye, orbit and visual system. Common diseases handled by these physicians include: cataracts, glaucoma, macular degeneration, diabetic eye disease and many other conditions that can lead to loss of vision. Ophthalmologists use sophisticated microsurgical techniques for cataract surgery and implants, laser surgery and refractive surgery, including LASIK. Most of these procedures, including cosmetic eyelid surgery, are performed at the Abington Surgical Center in Willow Grove. Retina surgical procedures are performed at Lansdale Hospital.