Welcome!
Dr. Nancy Herrold, Optometrist and staff are pleased to welcome you to our office. If you're looking for quality care with a personal touch, we hope you'll give us a call. We look forward to the opportunity of serving your family's optometric needs and would be delighted to have you as a patient.
We are conveniently located at 5100 Board Road, Mt. Wolf, Pennsylvania 17347. Please call us at 717.266.6602 for an appointment
The Importance of Regular Eye Exams
"Periodic optometric examinations are an important part of routine preventive health care. Many eye and vision conditions present no obvious symptoms. Therefore, individuals are often unaware that a problem exists. Early diagnosis and treatment are important for maintaining good vision and, when possible, preventing permanent vision loss.
The need for and frequency of optometric examinations vary with age, race, medical history, family history, occupation and other factors. Individuals with ocular signs or symptoms require prompt examination. In addition, the presence of certain risk factors may necessitate more frequent evaluations based on professional judgment. The following are the recommendations of the American Optometric Association for regular eye care. | Continued ...
How Your Eyes Work
Vision begins when light rays are reflected off an object and enter the eyes through the cornea, the transparent outer covering of the eye. The cornea bends or refracts the rays that pass through a round hole called the pupil. The iris, or colored portion of the eye that surrounds the pupil, opens and closes (making the pupil bigger or smaller) to regulate the amount of light passing through. The light rays then pass through the lens, which actually changes shape so it can further bend the rays and focus them on the retina at the back of the eye. The retina is a thin layer of tissue at the back of the eye that contains millions of tiny light-sensing nerve cells called rods and cones, which are named for their distinct shapes. Cones are concentrated in the center of the retina, in an area called the macula. In bright light conditions, cones provide clear, sharp central vision and detect colors and fine details. Rods are located outside the macula and extend all the way to the outer edge of the retina. They provide peripheral or side vision. Rods also allow the eyes to detect motion and help us see in dim light and at night. These cells in the retina convert the light into electrical impulses. The optic nerve sends these impulses to the brain where an image is produced. You can read more about "how your eye works" at the American Optometric Association.
