For those who need professional ophthalmology treatment, we have two operating suites in our office where we can perform surgical procedures on site such as LASIK, diabetic eye disease treatment, brow lifts, and blepharoplasties. As for intraocular surgeries for glaucoma or cataracts, we perform the surgeries at a local hospital so the care you need is never far from home. We also offer 24/7 emergency assistance so we can help you when you need us most. Just contact our emergency number at (801) 625-3039. 
By the end of the 19th century numerous other workers had entered the field of geometrical optics, notably an English physicist, Lord Rayleigh (John William Strutt), and a German physicist, Ernst Karl Abbe. It is impossible to list all their accomplishments here. Since 1940 there has been a great resurgence in optics on the basis of information and communication theory, which is treated at length below.

Vision problems can hinder learning, so children should get their first eye exam when they are around six months old. After this point and up until the age of 60, it's recommended to have an eye exam every two years. Yearly eye exams are recommended for those who are older than 60. Contact lens wearers should also go yearly to make sure their prescription has not changed.
In Nigeria, optometry is regulated by the Optometry and Dispensing Opticians Registration Board of Nigeria established under the Optometry and Dispensing Opticians ( Registration ETC ) Act of 1989 (Cap O9 Laws of Federation of Nigeria 2004). The Boards publishes from time to time lists of approved qualifications and training institutions in the federal government gazette.[15] The Doctor of Optometry degree is awarded after a six-year training at one of the accredited universities in Imo, Edo and Abia states.
No graphical construction can possibly be adequate to determine the aberration residual of a corrected lens, and for this an accurate trigonometrical computation must be made and carried out to six or seven decimal places, the angles being determined to single seconds of arc or less. There are many procedures for calculating the path of a ray through a system of spherical refracting or reflecting surfaces, the following being typical: The diagram in Figure 4 represents a ray lying in the meridian plane, defined as the plane containing the lens axis and the object point. A ray in this plane is defined by its slope angle, U, and by the length of the perpendicular, Q, drawn from the vertex (A) of the surface on to the ray. By drawing a line parallel to the incident ray through the centre of curvature C, to divide Q into two parts at N, the relation is stated as AN = r sin U, and NM = r sin I. Hence
A large astronomical mirror presents many problems to the optical engineer, mainly because even a distortion of a few microns of the mirror under its own weight will cause an intolerable blurring of the image. Though many schemes for supporting a mirror without strain have been tried, including one to support it on a bag of compressed air, the problem of completely eliminating mirror distortion remains unsolved. A metal mirror, if well ribbed on the back, may be lighter than a glass mirror and therefore easier to handle, but most metals are slightly flexible and require just as careful support as glass mirrors. Since temperature changes can also cause serious distortion in a mirror, astronomers try to hold observatory temperatures as constant as possible.
Tessa has been with Promontory for 3 years. She was in retail management for 15 years before joining the optical industry. She loves helping patients find the perfect frame that fits their personality. She grew up in the Ogden area and now resides in Syracuse with her husband and their three young children. Outside of the office she enjoys camping with her family and supporting her children in sports and competition tumbling. She also enjoys hiking with her family, spending time outdoors, going to the movies and she loves baking!
From this argument, it is clear that no visual instrument, such as a telescope, can possibly make anything appear brighter than when viewed directly. To be sure, a telescope having a large objective lens accepts more light from an object in proportion to the area of the lens aperture, but it magnifies the image area in the same proportion; so the increased light is spread over an increased area of the retina, and the illuminance remains unchanged. Actually, the telescopic view is always dimmer than the direct view because of light losses in the telescope due to glass absorption and surface reflections and because the exit pupil of the telescope may be smaller than the pupil of the eye, thus reducing the angle U′.
Tessa has been with Promontory for 3 years. She was in retail management for 15 years before joining the optical industry. She loves helping patients find the perfect frame that fits their personality. She grew up in the Ogden area and now resides in Syracuse with her husband and their three young children. Outside of the office she enjoys camping with her family and supporting her children in sports and competition tumbling. She also enjoys hiking with her family, spending time outdoors, going to the movies and she loves baking!
Optometrists have a four-year doctoral degree, but they are not medical doctors. Ophthalmologists are medical doctors who specialize in ophthalmology. Ophthalmologists are qualified to diagnose and treat a broader range of medical eye conditions than optometrists, and they can tackle more complex cases. Unlike optometrists, ophthalmologists are qualified to perform eye surgery.
For any one zone of the lens, x′ and y′ describe a vertical ellipse with major axis three times the minor axis. The images formed by all the smaller zones of the lens fit into this ellipse and fill it out with a uniform intensity of light. If the image plane is moved along the axis by a distance L, as in focussing a camera, then, at L = 2f 2h0′2S3, the ellipse shrinks to a radial focal line (R). Twice this displacement yields a circle; three times this L gives a tangential focal line (T), which is followed by an ellipse with its major axis in the x direction, as in Figure 8, bottom. The usual effect of astigmatism in an image is the appearance of radial or tangential blurring in the outer parts of the field.
At Dia­mond Vision, our staff of award-win­ning sur­geons, led by Dr. Steven Stet­son, pro­vide the very best care when it comes to vision cor­rec­tion. It is vital­ly impor­tant that we offer the lat­est tech­nol­o­gy and pro­ce­dures to ensure the very best results for each of our patients. To learn more about our doc­tors and the pro­ce­dures we offer, sched­ule your free con­sul­ta­tion today at
Doctors of Optometry (O.D.) can prescribe corrective lenses (glasses and contacts) to aid refractive errors (e.g., myopia, hyperopia, presbyopia, astigmatism). They also can manage vision development in children including amblyopia diagnosis and treatment and vision therapay. They claim they are highly educated in ocular diseases and their associations with systemic health. Many optometrists choose to specialize in a specific aspect of eye care (ie. specialty contact lenses, vision therapy, ocular disease, etc) and some complete a year long residency program. Optometrists are capable of treating and managing a multitude of ocular conditions.
Specialized Optical of Ogden is your personalized optometrist and eyecare facility. Having been in business for over 22 years, we have the experience you can trust. We provide comprehensive eye exams and therapeutic office visits. Our experienced and knowledgeable staff and optometrist are always quickly available to help you with your eyecare needs.
Many types of optical instruments form images by natural light, but some, such as microscopes and projectors, require a source of artificial light. Tungsten filament lamps are the most common, but if a very bright source is required, a carbon or xenon arc is employed. For some applications, mercury or other gas discharge tubes are used; a laser beam is often employed in scientific applications. Laser light is brilliant, monochromatic, collimated (the rays are parallel), and coherent (the waves are all in step with each other), any or all of these properties being of value in particular cases.
A single point of light, which may be a point in an extended object, emits light in the form of a continually expanding train of waves, spherical in shape and centred about the point of light. It is, however, often much more convenient to regard an object point as emitting fans of rays, the rays being straight lines everywhere perpendicular to the waves. When the light beam is refracted by a lens or reflected by a mirror, the curvature of the waves is changed, and the angular divergence of the ray bundle is similarly changed in such a way that the rays remain everywhere perpendicular to the waves. When aberrations are present, a convergent ray bundle does not shrink to a perfect point, and the emerging waves are then not truly spherical.
Our Kirkland Signature HD progressive lenses use the latest in lens manufacturing technology to deliver high definition vision at any distance. With sharper vision in all conditions members purchasing Kirkland Signature HD lenses will receive an unprecedented degree of customization. Included on all lenses is our anti-reflective treatment which provides superior scratch resistance, exceptional quality and gives each lens a cosmetically appealing look.
The Optomap retinal exam is revolutionizing how eye exams are performed. While eye exams generally include a look at the front of the eye to evaluate health and prescription changes, a thorough screening of the retina is critical to verify that your eye is healthy. This screening can lead to early detection of common diseases, such as glaucoma, diabetes, macular degeneration, and even cancer. The Optomap is a simple, quick and comfortable way to maintain optimum eye health. Learn More...
The five Seidel sums can be calculated by tracing a paraxial ray from object to image through the lens and by tracing also a paraxial principal ray from the centre of the aperture stop outward in both directions toward the object and image, respectively. The angle of incidence i and the ray slope angle u of each of these paraxial rays at each surface are then listed and inserted into the following expressions for the five sums. The angle u′0 represents the final emerging slope of the paraxial ray.
The finite size of the Airy disk sets an inevitable limit to the possible resolving power of a visual instrument. Rayleigh found that two adjacent and equally bright stars can just be resolved if the image of one star falls somewhere near the innermost dark ring in the Airy disk of the other star; the resolving power of a lens can therefore be regarded as about half the f-number of the lens expressed in microns. The angular resolution of a telescope is equal to the angle subtended by the least resolvable image separation at the focal length of the objective, the light-gathering lens. This works out at about four and a half seconds of arc divided by the diameter of the objective in inches.
I was charged $40 on top of my copay for a FITTING for contacts. I've never been charged any money, let alone $40 dollars. They also did not tell me that the fitting costs money! I was there for an exam to replace my glasses. I didn't buy contacts and at the end of my appointment I was expecting to pay my copay of $3 and was charged $43. I was shocked, but had to pay because they already did the fitting. Even the contacts say on them, "free trial" and the prices to get lenses for my glasses are extremely overpriced. I took my prescription and will be going elsewhere to get the lenses. The doctor and staff were nice but I will not be returning to Standard Optical.
This procedure will be applied to each of the five aberration terms separately, assuming that all the other aberrations are absent. Obviously, in a perfect lens x′ and y′ are zero because OPD is zero. It must be remembered, however, that by using rays instead of waves, all fine-structure effects caused by diffraction will be lost, and only the macroscopic image structure will be retained.

“I had to write to say thank you for all that was done for our son. Last February 2018 our son had his eyes tested at school. It came back and we were told they had some concerns. We went and took him to Vision Source of Farr West to have his eyes looked at; Ian Whipple is our doctor. I was surprised and almost started crying when I found out my sweet 6 year old boy could only read the top line of the chart. He has a bad astigmatism and without it being caught early could affect his vision into adulthood!! I was so heartbroken and felt so guilty I had no idea he couldn't sew and he never complained or had any signs of bad vision he never told me he couldn't see the clearly. So we immediately got him a pair of glasses to correct his astigmatism and vision problems. Over the past months this year his vision has drastically improved and his glasses became a part of who he was. It fits his personality and he was proud to wear them. . . Since our son has received his glasses his attention in class has improved he has been listening more to teachers and to me at home and he has excelled in school. His interest in reading is incredible he had no interest and now has a huge desire to read because now he can actually see what he is reading. . . Last year in Kindergarten I found out he was playing alone at recess because from far away he said he couldn't tell what kids were his friends. He had little friends he couldn't remember who they are and wouldn't identify them by their faces but by the color their jacket or shirt was. . . He now has so many friends I can't keep up on play dates. I never knew a pair of glasses could make him grow in such leaps and bounds. . . Thanks to the school's vision screening and Dr. Whipple our son now with his glasses has 20 /20 vision. I did not expect his eyes to do so well and now he can see the world more clearly than me! I hope this story inspires other parents to have their kids tested for their vision I thought our son could possibly have some social problems, little did I know his vision was affecting his life and behavior and possibly his future. Thanks to Vision Source of Farr West and their advanced testing our son has a brighter future and the possibilities are endless and crystal clear.”
The difference between the refractive indices of a transparent material for a specific blue light and a specific red light is known as the dispersion of the material. The usual choices of blue and red lights are the so-called “F” and “C” lines of hydrogen in the solar spectrum, named by Fraunhofer, with wavelengths 4861 and 6563 angstroms (the angstrom unit, abbreviated Å, is 10−8 centimetre), respectively. It is generally more significant, however, to compare the dispersion with the mean refractive index of the material for some intermediate colour such as the sodium “D” Fraunhofer line of wavelength 5893 angstroms. The dispersive power (w) of the material is then defined as the ratio of the difference between the “F” and “C” indices and the “D” index reduced by 1, or,
Reports of identity theft and fraud among optometrists have created concern within the profession and at its educational and professional organizations. NBEO undertook an investigation as to whether a security compromise of personal information within NBEO's care had occurred. A thorough forensic investigation into this issue has now been completed and found no evidence of a compromise of personal information within NBEO's care. Of course, regular monitoring of financial accounts and personal credit files for suspicious activity is advisable for us all. If you have experienced actual or suspected identity theft or fraud, you should immediately report it to law enforcement.
Contact lenses have come a long way, and they can work for all types of prescriptions! They can be very comfortable and easy to wear, especially with the most updated lightweight technology. We can help find the right contacts for your prescription. There are even bi-focal and multi-focal options to evolve with your vision needs. They can be very beneficial to an active lifestyle, and a great alternative to rotate with your eyeglasses, so be sure to ask us at your next visit.
If a lens is used to form an image of a plane object that is tilted relative to the lens axis, then the image will also be tilted in such a way that the plane of the object, the plane of the image, and the median plane of the lens all meet. This construction can be derived by the use of the lateral and longitudinal magnification relations just established above. With a tilted object the magnification at any point is given by the ratio of the distances of image and object from the lens at that point in the image, and, consequently, m varies progressively from one end of the image to the other. This arrangement is frequently used in view cameras equipped with “swings” to increase depth of field and in enlargers to rectify the convergence of parallel lines caused by tilting the camera, for example, in photographing tall buildings. The rule finds extensive application in photogrammetry and in the making of maps from aerial photographs.
We make eye care easy at your Riverdale Target Optical located at 1135 W Riverdale Rd. Every day we deliver on our "expect more, pay less" promise by bringing together quality eye care, fashion, affordability and a simple, fun shopping experience. You always get more looks for less with your eyeglasses and sunglasses with top brands like Ray-Ban, DKNY, Armani Exchange, Oakley and more. And popular brands of contacts like Acuvue, Air Optix and specialty lenses. Whatever your choice, you get a great value on our quality lenses with a 90-day unconditional guarantee. We’re here to help you get the most from your insurance benefits and answer all your questions quickly. And when it comes to taking care of your eyes, we can't say enough about the importance of an annual eye exam. Eye exams available by Independent Doctors of Optometry next to Target Optical.
By the end of the 19th century numerous other workers had entered the field of geometrical optics, notably an English physicist, Lord Rayleigh (John William Strutt), and a German physicist, Ernst Karl Abbe. It is impossible to list all their accomplishments here. Since 1940 there has been a great resurgence in optics on the basis of information and communication theory, which is treated at length below.
Optometry is a health care profession that involves examining the eyes and applicable visual systems for defects or abnormalities as well as the medical diagnosis and management of eye disease. Traditionally, the field of optometry began with the primary focus of correcting refractive error through the use of spectacles. Modern day optometry, however, has evolved through time so that the educational curriculum additionally includes intensive medical training in the diagnosis and management of ocular disease, in most of the countries of the world, where the profession is established and regulated.