18 documents found, page 1 of 2
Wavefront sensing for objective assessment of vision therapy efficacy: prelimin...
Gomes, Jéssica Rafaela Moreira; Sapkota, Kishor; Franco, SandraThe aim of this study was to use wavefront sensing to objectively evaluate the effects of vision therapy in subjects with insufficiency (AI) and infacility of accommodation (AINF). Aberrometry was performed with a Shack-Hartmann wavefront aberrometer for different accommodative stimuli in one subject with AI and one with AINF before and after treatment with vision therapy (VT). A control subject received a plac...
Real-time wavefront aberrometry in subjects with accommodative excess
Gomes, Jessica; Sapkota, Kishor; Franco, SandraThe purpose of this study was to use real-time wavefront aberrometry to detect accommodative excess (AE) and to analyse the optical quality of the eye in subjects with this dysfunction. AE was detected from the accommodative response obtained by real-time wavefront aberrometry. These subjects had a significant accommodative lead to all stimuli and had difficulty relaxing accommodation. The root mean square (RMS...
Central and peripheral ocular high-order aberrations and their relationship wit...
Gomes, Jessica; Sapkota, Kishor; Franco, SandraHigh-order aberrations (HOAs) are optical defects that degrade the image quality. They change with factors such as pupil diameter, age, and accommodation. The changes in optical aberrations during accommodation are mainly due to lens shape and position changes. Primary spherical aberration (Z(4.0)) is closely related to accommodation and some studies suggested that it plays an important role in the control of a...
Spherical aberration and accommodative insufficiency: Is there a Link?
Gomes, Jessica; Sapkota, Kishor; Franco, SandraGiven the relationship between spherical aberrations and accommodation, the study of these aberrations can be helpful to understand accommodative response in subjects with accommodative dysfunctions. The purpose of this study was to evaluate on-axis and off-axis changes of primary and secondary spherical aberrations, Z(4,0) and Z(6,0), with accommodation in subjects with accommodative insufficiency (AI). Ten su...
Effect of accommodation on coma at central and peripheral retina
Sapkota, Kishor; Gomes, Jessica; Franco, SandraComa is one of the most common ocular higher order aberrations and highly affects the quality of image. It is assumed that corneal aberrations are balanced by internal (lenticular) aberrations so that retinal image quality may not have great impact. However, during accommodation, the shape, position, and curvature of the crystalline lens changes which might disrupt this balance between internal and corneal aber...
Effect of accommodation on peripheral higher order aberrations
Sapkota, Kishor; Gomes, Jessica; Franco, SandraKnowledge of the effect of accommodation on image quality of peripheral retina is crucial for better understanding of the visual system, but only a few studies have been carried out in this area. This study was designed to evaluate the effect of accommodation on higher order aberrations from third to sixth Zernike polynomials in central and peripheral retina up to 23° off-axis. We used a Hartmann–Shack aberrome...
Assessment of central and peripheral accommodative lag by aberrometry
Sapkota, Kishor; Gomes, Jessica; Franco, SandraAccommodation lag is important factor for normal vision. Higher lag of accommodation may cause various ocular symptoms particularly during near tasks. In this study, the lag of accommodation was assessed in the peripheral retina and it was compared with the central accommodative lag with aberrometer. In this cross-sectional study, fifty-three young subjects with normal visual acuity and without any active ocula...
Reply to letter to the editor by London and Erdinest on “Contrast sensitivity f...
Sapkota, Kishor; Franco, Sandra; Lira, Madalena[Excerpt] We would like to thank London and Erdinest for their comment and interest in our study entitled ‘‘Contrast sensitivity function with soft contact lenses’’ in which we had evaluated contrast sensitivity function with spectacles and contact lenses.1 In this longitudinal study, we found better CSF with contact lenses in comparison to spectacles. Furthermore, the CSF with CL was found similar after three ...
Contrast sensitivity function with soft contact lens wear
Sapkota, Kishor; Franco, Sandra; Lira, MadalenaPurposes: To compare contrast sensitivity function (CSF) with soft contact lens (SCL) and spectacles wear. To investigate the effect of a three-month period of SCL wear on CSF.Methods: Forty-seven myopic subjects with no history of contact lens (CL) wear were included in this longitudinal prospective study. CSF was measured with spectacles using the CSV-1000 (VectorVision, Greenvile, OH). Subsequently, subjects...
Daily versus monthly disposable contact lens: Which is better for ocular surfac...
Sapkota, Kishor; Franco, Sandra; Lira, MadalenaPurpose: To investigate the effect of soft contact lenses (SCL) wearing modality and lens materials on the changes in conjunctival bulbar and limbal redness and conjunctival and corneal staining after two months of SCL wear. Comfort level was also analyzed. Methods: In this longitudinal clinical trial, forty-seven neophyte myopic subjects were fitted with a monthly disposable lens (lotrafilcon-B or comfilcon-A ...