previous evidence has shown that the number of l and m cones in retina varies significantly between subjects. however, it is not clear how the variation of l/m ratio changes the behavioral performance of the subject. a model of transformation of data from retina to visual cortex for evaluation of various l/m cones ratios is presented. while l/m cone ratios close to 1 brings the best performance...

retina is a part of the central nervous system derived from the neuroectoderm and made up of 5 layers.in this study, the changes in the thickness of the retinal layers as a consequence of diabetes and effect of aloe vera gel extract in male rats were assessed. thirty sprague dawley adult male rats (175 ± 25 g) in two age groups (4 and 8 weeks) were divided into 6 groups of 5 as control, diabeti...

the big eye kilka, clupeonella grimmi, is a marine fish living in depth of 20 to 200 meter of the caspian sea. its eye and retina were processed for histological and sem studies. paraffin embedded retina was cut radially and tangentially in 5 ?m thickness and stained with hematoxylin and eosin method. the unstained sections were manipulated for sem image observations. tangential retinal section...

purpose: to present a case of chorioretinitis sclopetaria with attached retina in spite of performing deep vitrectomy without retinopexy. patient and findings: a 10-year-old boy was reffered due to air-gun injury to the left eye. right eye had visual acuity of 20/16, mg-, and normal slit lamp examination and fundoscopy. in the left eye, visual acuity was count fingers at 50 cm, mg+++, anterior ...

Background & Aims: Age-related macular degeneration (ARMD) is one of the common retina disorders that can lead to loss of vision by increase in age. In this study, the efficacy of a non-invasive ultrasound technique for the evaluation of alastic properties of eye in the diagnosis of ARMD has been evaluated. Methods: For estimation of the elastic modulus of eye, spatial loading system designed a...

Intraocular metastatic tumors have been increasingly reported in the recent past. Unlike choroidal metastasis, metastasis to retina is very rare and so far has been reported in very few case reports only. A 56 year-old male who presented with a history of adenocarcinoma of the cecum and underwent lap colectomy for the primary cecal tumor, received adjuvant chemotherapy for a year after surgery ...

IMPORTANCE Metastatic tumors of the retina are rare, simulate retinitis, and are associated with poor patient survival. OBJECTIVE To describe the clinical features and outcomes of patients with retinal metastasis from systemic cancer. DESIGN, SETTING, AND PARTICIPANTS Retrospective case series of 8 patients with retinal metastasis from cutaneous melanoma (n = 4), breast cancer (n =2), esoph...