Dr. Weinstock is a board-certified ophthalmologist. He practices general ophthalmology in Canton, Ohio, with a special interest in contact lenses. He holds faculty positions of Professor of Ophthalmology at the Northeastern Ohio Colleges of Medicine and Affiliate Clinical Professor in the Charles E. Schmidt College of Biomedical Science at Florida Atlantic University.
Andrew A. Dahl, MD, is a board-certified ophthalmologist. Dr. Dahl's educational background includes a BA with Honors and Distinction from Wesleyan University, Middletown, CT, and an MD from Cornell University, where he was selected for Alpha Omega Alpha, the national medical honor society. He had an internal medical internship at the New York Hospital/Cornell Medical Center.
Retinitis pigmentosa is the most common of a
group of hereditary progressive retinal degenerations or dystrophies. There is
considerable variation and overlap among the various forms of retinitis
pigmentosa. Common to all of them is progressive degeneration of the retina,
specifically of the light receptors, known as the rods and cones. The rods of
the retina are involved earlier in the course of the disease, and cone
deterioration occurs later. In this progressive degeneration of the retina, the
peripheral vision slowly constricts and central vision is usually retained until
late in the disease.
What causes retinitis pigmentosa?
Retinitis pigmentosa is an inherited condition which involves both eyes. If
it starts in one eye, the other eye usually develops the same condition in a
number of years. Most cases are familial, inherited in a variety of ways,
including dominant, recessive, and sex-linked recessive. Some cases are sporadic
and lack a family history of the disease. A thorough genetic pedigree, often
with the aid of a genetic counselor, is essential in determining risk of future
generations acquiring the disease.
Retinitis pigmentosa is usually diagnosed
during the teenage years but may be present at birth. The latter congenital
type is usually fairly stable and nonprogressive. Cases that are diagnosed
later in life are often milder and may progress more slowly.
approximately 75,000 people in the United States with retinitis pigmentosa (RP).
RP is sometimes associated with other systemic illnesses. Usher syndrome,
characterized by retinitis pigmentosa and neural hearing loss, is the most
common cause of deaf-blindness in the United States. The hearing loss usually is
diagnosed earlier than the eye changes.
pigmentosa begins as rod degeneration, the patient first notices increasing
difficulty in night vision, followed by difficulty seeing in the periphery.
Slowly progressive constriction of the visual field leads to tunnel vision. A
small area of central vision in both eyes usually persists for years. Generally
night precedes tunnel vision by years or even decades. Total blindness
eventually ensues in most cases. The age of appearance of legal blindness ranges
from as early as childhood to as late as the 40s.
A visual field test is a method of measuring an individual's entire scope of vision, that is their central and peripheral (side) vision. Visual field testing actually maps the visual fields of each eye ind"...