Binocular vision left and right images are fused, resulting in single, 3-dimensional vision. Presbyopia visual impairment due to old age. Ciliary body is less elastic, impairing vision. Laser therapy can tighten fibers or create hole to drain some of the fluid. Macular degeneration degeneration of yellowish region at back of retina causes severe loss of central vision.
Peripheral vision is retained.
Retinal detachment separation of layers due to eye trauma, head injuries, bleeding, scarring from infection, shrinkage of vitreous humor. Patients may see flashes of light. Photocoagulation Cryotherapy Clinical Procedures Diagnostic Ophthalmoscopy visual exam of the interior of the eye. Fluorescein angiography fluorescein dye injected IV to detect movement of blood diabetic or hypertensive retinopathy, lesions in macular area. Tonometry measure pressure within eye glaucoma.