Showing posts with label optometry journals. Show all posts
Showing posts with label optometry journals. Show all posts

Thursday, 22 June 2017

Impact of Amblyopia Treatment on Vision-Related Quality Of Life


Treatment of amblyopia during childhood can have both positive and negative impacts in later life. The treatment of amblyopia could influence Vision-related Quality of Life in adults and children, particularly social relationships and emotions. For example, children with a history of occlusion were 35% to 37% more likely than children without visual defects to have suffered from verbal or physical bullying at school. Many parents associate occlusion treatment with a decrease in children’s self-confidence because of poor vision during occlusion and report greater distress and more conflict at home.

optometry journal articles
Koklanis et al. conducted a study in Australia on the psychosocial impact of amblyopia and its treatment from both the children (aged 3 to 15 years) and parents’ perspectives. The investigators performed a semi-structured interview with both children with amblyopia and their parents. In addition, parents were asked to complete a psychological inventory, the Behaviour Assessment System for Children. The study showed that dealing with stigma and the perceptions and responses of peers were found to be of central significance in amblyopia therapy and that stigma and the perceptions of peers had adverse consequences for some children’s identity and psychosocial well being.

Thursday, 8 June 2017

Stereoscopic Memory When Stimuli No Longer Persist: Void and Binocular Intervals in Alternating Monocular Presentations

It was early realized by Exner in 1875 that stereopsis could occur when both eyes together receive the two images of a stereo pair one after the other. Stereopsis occurs even when a void interval is inserted between the presentations of each image.
optometry journals
For instance, Ogle found that stereopsis occurred when two 18 ms presentations were separated by a void interval of 100 ms. Stereopsis has also been studied with protocols in which the two images of a stereo pair were presented cyclically, in alternation to the two eyes. Guilloz - who was motivated by a practical interest in 3d X-ray radioscopy - produced cyclical presentations to the two eyes using a disk rotating in front of a stereoscope lenses. He also described how natural scenes are perceived through his apparatus.

Tuesday, 16 May 2017

Anterior Vitreous Incarceration after Phacoemulsification Cataract Extraction Imaged with Spectral-Domain Optical Coherence Tomography

optometry journal articles
Anterior vitreous incarceration is a condition in which vitreous prolapses into the anterior chamber and passes through a microscopic wound at an incisional site. The condition can be identified as a vitreous strand leading to the wound site during slit lamp examination. If the vitreous strand penetrates through all the corneal layers on to the extra ocular surface it becomes vitreous wick syndrome. Anterior segment imaging with spectral-domain optical coherence tomography of the iridocorneal angle can provide high definition scans to confirm vitreous incarceration and rule out vitreous wicking. It is important to appropriately diagnose this condition to prevent vision threatening complications.

Thursday, 30 March 2017

Review: Measurement Techniques for Intraocular Pressure

It is important to determine the intra-ocular pressure, the fluid pressure inside the eye, in order to evaluate for patients at risk from glaucoma, because of potential damage to the optic nerve. 

journal of optometry and vision science
Tonometers are calibrated to measure pressure in millimeters of mercury [mmHg]. There are many different types of tonometers, including Schiotz, Goldmann, Perkins, Marg-MacKay, Air-Puff (American Optical), and the new “Triggerfish” wireless contact lens (Sensimed AG). Preliminary mechanics and development work in this area was presented by Friedenwald. This list is certainly not exhaustive, as there are many new devices developed in recent years, including the Tono-Pen, ocular bounce, resonant tonography, and dynamic pascal tonometry.