ABCD law for Gaussian laser beams
... through focus. In the absence of the lens, there is a tendency for the beam to grow via diffraction, especially if the beam waist is small. This tendency competes with the focusing effect of the lens, and a new beam waist can occur at a wide range of locations, depending on the exact outcome of this ...
... through focus. In the absence of the lens, there is a tendency for the beam to grow via diffraction, especially if the beam waist is small. This tendency competes with the focusing effect of the lens, and a new beam waist can occur at a wide range of locations, depending on the exact outcome of this ...
Refraction and its uses
... lacemakers' condensors, were used in the early nineteenth century by lacemakers to help them see their work. • Light passing through these condensors was bent and refracted in such a way, so that the rays meet and converge at a small and concentrated point and light up only a small area of the cloth ...
... lacemakers' condensors, were used in the early nineteenth century by lacemakers to help them see their work. • Light passing through these condensors was bent and refracted in such a way, so that the rays meet and converge at a small and concentrated point and light up only a small area of the cloth ...
Management of Pseudophakic Retinal Detachment
... under general anesthesia but some under local anesthesia by different surgeons. Three ports pars plana vitrectomy (PPV) was performed using BIOM (Binocular indirect ophthalmo microscope). In all eyes central and peripheral vitreous was removed, followed by removal of all vitreous traction on retinal ...
... under general anesthesia but some under local anesthesia by different surgeons. Three ports pars plana vitrectomy (PPV) was performed using BIOM (Binocular indirect ophthalmo microscope). In all eyes central and peripheral vitreous was removed, followed by removal of all vitreous traction on retinal ...
Genetic epidemiology used to identify risk factors for eye
... graded using an objective densitometry-based system. Genotypes were obtained using Illumina platforms (610K and 317K) and later imputed against the HapMapII panel. Next generation sequencing data was available for a subset of 940 individuals. Common genetic variants were analysed using a score-test- ...
... graded using an objective densitometry-based system. Genotypes were obtained using Illumina platforms (610K and 317K) and later imputed against the HapMapII panel. Next generation sequencing data was available for a subset of 940 individuals. Common genetic variants were analysed using a score-test- ...
Word Version in English
... Possible complications and side effects of the procedure and administration of Lucentis™ (ranibizumab) include but are not limited to retinal detachment, cataract formation (clouding of the lens of the eye), glaucoma (increased pressure in the eye), hypotony (reduced pressure in the eye), damage to ...
... Possible complications and side effects of the procedure and administration of Lucentis™ (ranibizumab) include but are not limited to retinal detachment, cataract formation (clouding of the lens of the eye), glaucoma (increased pressure in the eye), hypotony (reduced pressure in the eye), damage to ...
Tutorial of Telecentric Lens
... taken by zero angle field of view telecentric lens is hard to tell which cube is in front of the other, but for the photo taken by fixed focal length lens is so obvious the bigger cube is in front of the smaller one. This comparison described the importance of minimizing the parallel error, because ...
... taken by zero angle field of view telecentric lens is hard to tell which cube is in front of the other, but for the photo taken by fixed focal length lens is so obvious the bigger cube is in front of the smaller one. This comparison described the importance of minimizing the parallel error, because ...
Introduction - Fas Harvard
... A reflecting material called Scotchlite, which uses this principle, can be obtained in most hardware stores. It is used for bright road signs, the paint used for the white lines on highways, license plates, safety reflectors, and decorating, among other things. Examine it with a magnifying glass. Yo ...
... A reflecting material called Scotchlite, which uses this principle, can be obtained in most hardware stores. It is used for bright road signs, the paint used for the white lines on highways, license plates, safety reflectors, and decorating, among other things. Examine it with a magnifying glass. Yo ...
TORIC MONOFOCAL AND MULTIFOCAL IOLs TIPS AND TRICKS
... Red indicates values where Z CALC will not continue to calculate the toric IOL. We should always compare the results of both eyes. If historical subjective refraction is available, check for ...
... Red indicates values where Z CALC will not continue to calculate the toric IOL. We should always compare the results of both eyes. If historical subjective refraction is available, check for ...
Capsulorhexis Marker - Cairo University E
... and IOL surgery. Ophthalmic surgical dyes have become valuable tools and are now widely used for both anterior and posterior segment indications. In this study we presented the capsulorhexis marker which is applied directly on the anterior capsule in order to help in better centration and sizing of ...
... and IOL surgery. Ophthalmic surgical dyes have become valuable tools and are now widely used for both anterior and posterior segment indications. In this study we presented the capsulorhexis marker which is applied directly on the anterior capsule in order to help in better centration and sizing of ...
CRS10c
... V good trainees set up the slit lamp illumination and eyepieces before commencing the examination. They help the patient to get into position if necessary. They warn the patient of the brightness of the light. They ensure that the patient's ocular surface is adequately anaesthetised. They choose the ...
... V good trainees set up the slit lamp illumination and eyepieces before commencing the examination. They help the patient to get into position if necessary. They warn the patient of the brightness of the light. They ensure that the patient's ocular surface is adequately anaesthetised. They choose the ...
Cataract Refractive Surgical Practice
... the patient is aware that he or she has astigmatism and then explain what astigmatism is in layman’s terms. I show the patients the topography and, after a brief explanation, most patients are interested in astigmatism correction. The surgeon should then describe the IOL options available for catara ...
... the patient is aware that he or she has astigmatism and then explain what astigmatism is in layman’s terms. I show the patients the topography and, after a brief explanation, most patients are interested in astigmatism correction. The surgeon should then describe the IOL options available for catara ...
glaucoma - Group D2
... (pigment) found in the iris and the part of the eye that produces fluid (ciliary body). These flakes of pigment block the fluid drainage system of the eye. This type of secondary glaucoma is called pigmentary glaucoma ...
... (pigment) found in the iris and the part of the eye that produces fluid (ciliary body). These flakes of pigment block the fluid drainage system of the eye. This type of secondary glaucoma is called pigmentary glaucoma ...
Psychosocial Effects of Low Vision
... the retina, but dense everywhere else, enable peripheral vision and vision in dim light or darkness. • Retinal dystrophy is a general term to describe a condition where there is degeneration of the cells in the retina. ...
... the retina, but dense everywhere else, enable peripheral vision and vision in dim light or darkness. • Retinal dystrophy is a general term to describe a condition where there is degeneration of the cells in the retina. ...
Medial canthoplasty - Centre vétérinaire DMV
... Dogs with large flat faces (brachycephales) are at high risk of getting eye problems during their life, and sometimes very early in time, because of various reasons due to their conformation. These factors include a big ocular globe (therefore more exposed), a shallow orbital cavity (therefore the g ...
... Dogs with large flat faces (brachycephales) are at high risk of getting eye problems during their life, and sometimes very early in time, because of various reasons due to their conformation. These factors include a big ocular globe (therefore more exposed), a shallow orbital cavity (therefore the g ...
Calculation Part
... 13. Which is not correct when describing the formation of rainbows? A. A rainbow is really spherical in nature. B. Sunlight is spread into a spectrum when it enters a spherical raindrop. C. Sunlight is internally reflected on the back side of a raindrop. D. All wavelengths refract at the same angle. ...
... 13. Which is not correct when describing the formation of rainbows? A. A rainbow is really spherical in nature. B. Sunlight is spread into a spectrum when it enters a spherical raindrop. C. Sunlight is internally reflected on the back side of a raindrop. D. All wavelengths refract at the same angle. ...
None of the authors has a financial or proprietary interest in
... The anterior chamber was quiet and the intraocular lens was well placed. Fundus examination revealed a media clarity of grade one. On careful examination a cilium was found protruding out of one of the upper meibomian gland orifice (Figure 1a). The tapered end of the hair shaft was hidden within the ...
... The anterior chamber was quiet and the intraocular lens was well placed. Fundus examination revealed a media clarity of grade one. On careful examination a cilium was found protruding out of one of the upper meibomian gland orifice (Figure 1a). The tapered end of the hair shaft was hidden within the ...
Full text
... the dimensions and shapes of the patterns we can generate: the driving amplitude, the driving frequency, and the phase shift between the driving signal and the laser trigger. For this study, we have focused our attention on simple shapes including annuli and single spots, although the TAG lens is ca ...
... the dimensions and shapes of the patterns we can generate: the driving amplitude, the driving frequency, and the phase shift between the driving signal and the laser trigger. For this study, we have focused our attention on simple shapes including annuli and single spots, although the TAG lens is ca ...
contact lens information guide
... a follow-up visit to ensure good eye health and that your lenses are performing optimally for daily use. Specialized prescriptions may require more follow-up visits. Please arrive to your follow-up visits wearing the contact lenses for a minimum of two hours. You can order contact lenses after your ...
... a follow-up visit to ensure good eye health and that your lenses are performing optimally for daily use. Specialized prescriptions may require more follow-up visits. Please arrive to your follow-up visits wearing the contact lenses for a minimum of two hours. You can order contact lenses after your ...
Dynamic pulsed-beam shaping using a TAG lens in the
... the dimensions and shapes of the patterns we can generate: the driving amplitude, the driving frequency, and the phase shift between the driving signal and the laser trigger. For this study, we have focused our attention on simple shapes including annuli and single spots, although the TAG lens is ca ...
... the dimensions and shapes of the patterns we can generate: the driving amplitude, the driving frequency, and the phase shift between the driving signal and the laser trigger. For this study, we have focused our attention on simple shapes including annuli and single spots, although the TAG lens is ca ...
How to instill eye drops and avoid contamination
... of the bottle back in place immediately after use. Anesthetic drops are an exception to the method in which the patient looks up. When instilling anesthetic drops, ask the patient to look down and direct the drop to the 12 o’clock position of the sclera. This method is used because drops placed into ...
... of the bottle back in place immediately after use. Anesthetic drops are an exception to the method in which the patient looks up. When instilling anesthetic drops, ask the patient to look down and direct the drop to the 12 o’clock position of the sclera. This method is used because drops placed into ...
We`ve developed this handbook to help our patients become better
... As with all procedures, laser vision correction is not without risks and side effects. Your eyes may receive an over-treatment or an under-treatment resulting in blurry vision. In some cases, this can be improved by performing additional laser treatment that is usually done at least three months aft ...
... As with all procedures, laser vision correction is not without risks and side effects. Your eyes may receive an over-treatment or an under-treatment resulting in blurry vision. In some cases, this can be improved by performing additional laser treatment that is usually done at least three months aft ...
Choosing Your Antiglare Filters Click here to save direct to your PC
... often thought that ‘dark glasses’ will protect the eyes more effectively than those with a light tint. This is of course not true. Additionally some people experiencing a visual impairment will try to fit into the role of a ‘stereo-typical blind person’ by wearing dark glasses because they think tha ...
... often thought that ‘dark glasses’ will protect the eyes more effectively than those with a light tint. This is of course not true. Additionally some people experiencing a visual impairment will try to fit into the role of a ‘stereo-typical blind person’ by wearing dark glasses because they think tha ...
on the cuttinG eDGe without the BLaDe! LasiK
... during allergy season, sufferers can do much to manage the severity of their symptoms. However, if one is outdoors, avoidance of pollen is often impossible so medical treatment might become necessary. Recently, a prescription eyedrop for the treatment of eye allergies has become over-the-counter. Za ...
... during allergy season, sufferers can do much to manage the severity of their symptoms. However, if one is outdoors, avoidance of pollen is often impossible so medical treatment might become necessary. Recently, a prescription eyedrop for the treatment of eye allergies has become over-the-counter. Za ...
Retained IOL fragment and corneal decompensation after
... transection with a wire-snare or scissors enables extraction through small incisions. This removal technique also facilitates the creation of small IOL fragments or slivers, especially when multiple passes of the cutting instrument are necessary to complete IOL transection. In our patient, it is unl ...
... transection with a wire-snare or scissors enables extraction through small incisions. This removal technique also facilitates the creation of small IOL fragments or slivers, especially when multiple passes of the cutting instrument are necessary to complete IOL transection. In our patient, it is unl ...
2007 AMO_San Diego Supplement-2=dl final.qxd
... that can reduce contrast sensitivity. The one-piece lens design contributes to reliable lens centration and reduction in cell migration. Traditionally one-piece lenses have a tendency to move around in the bag. However, this lens is designed to stay nicely in place as a result of three fixation poin ...
... that can reduce contrast sensitivity. The one-piece lens design contributes to reliable lens centration and reduction in cell migration. Traditionally one-piece lenses have a tendency to move around in the bag. However, this lens is designed to stay nicely in place as a result of three fixation poin ...
Cataract
A cataract is a clouding of the lens in the eye leading to a decrease in vision. It can affect one or both eyes. Often it develops slowly. Symptoms may include faded colors, blurry vision, halos around light, trouble with bright lights, and trouble seeing at night. This may result in trouble driving, reading, or recognizing faces. Poor vision may also result in an increased risk of falling and depression. Cataracts are the cause of half of blindness and 33% of visual impairment worldwide.Cataracts are most commonly due to aging, but may also occur due to trauma, radiation exposure, be present from birth, or occur following eye surgery for other problems. Risk factors include diabetes, smoking tobacco, prolonged exposure to sunlight, and alcohol. Either clumps of protein or yellow-brown pigment may be deposited in the lens reducing the transmission of light to the retina at the back of the eye. Diagnosis is by an eye examination.Prevention includes wearing sunglasses and not smoking. Early on the symptoms may be improved with eyeglasses. If this does not help, surgery to remove the cloudy lens and replace it with an artificial lens is the only effective treatment. Surgery is only needed if the cataracts are causing problems. Surgery generally results in an improved quality of life. Cataract surgery is not easily available in many countries, which is especially true of women.About 20 million people globally are blind due to cataracts. It is the cause of about 5% of blindness in the United States and nearly 60% of blindness in parts of Africa and South America. Blindness from cataracts occurs in about 10 to 40 per 100,000 children in the developing world and 1 to 4 per 100,000 children in the developed world. Cataracts become more common with age. About half the people in the United States have had cataracts by the age of 80.