Temporal Visual Field Border

Abstract

The aim of the study was to determine the physiological temporal visual field border, based on theoretical calculations and by perimetric examination itself. Materials and Methods: A perimetry test was performed on 15 healthy subjects -seven women (27-30 years old) and eight men (28-46 years old), all of whom had healthy eyes with a visual acuity value of 1.0. The visual field was evaluated using a Medmont M700 with nasal displacement of the fixation point of 40 degrees. In total, 179 examined points of visual field were included. The model of the entry of temporal rays into the eye was created on the basis of the measured biometric values of the eye and with the help of the AD systems AutoCad and SolidWorks. RayViz for SolidWorks was able to simulate the passage of light rays through the model. Results: The temporal part of the subjective visual field border was up to 110 degrees in all eyes. Modelling of the input rays based on geometric optics in one of the participants in the testing revealed a theoretical temporal boundary of the visual field of 102 degrees. Conclusion: Theoretical calculations of geometric optics have shown that the temporal boundary of the visual field reaches up to 102 degrees in a healthy individual. By perimetric examination, this limit reached 110 degrees.

The Far Nasal Part of the Visual Field – Part I

“…Na základě geometrické optiky a biometrických údajů měřeného oka jsme v předchozí práci zjišťovali, pod jak velkým úhlem vstupující paprsky jsou ještě schopny do-padnout na zadní pól oka. Prošly paprsky vstupující do oka pod úhly do 102 stupňů při šíři pupily 4,64 mm (Obrázek 3) [9].…”

“…Pro nesoulad v hodnotách temporální hranice zorného pole jsme v předchozí práci provedli verifikaci jejich hodnot pomocí subjektivního vyšetření a tento výsledek jsme ověřili i teoretickým výpočtem. U zdravých osob jsme zjistili temporální hranice zorného pole ve 110 stupních [9]. Rovněž nás zajímalo, jak je to se vzdálenou nasální částí zorného pole, která je prakticky nepoužíva-ná.…”

Distal Nasal Part of the Visual Field and RNFL in Primary Open-Angle Glaucoma

“…With a normal visual field tested by the fast threshold glaucoma program (nasal to 50, temporal to 22 degrees), distal nasal periphery visual field changes were found in the entire cohort. 14 In our previous study, where we investigated the relationship between RNFL and pathological IOP, we demonstrated peripapillary RNFL damage in inferior-temporal (1), superior-temporal (4), superior-nasal (5), and inferior-nasal (8) segments in pathological intraocular pressure (IOP). 15 As vessel density (VD) also makes a significant contribution to the total value of RNFL, we performed statistical correction of VD from RNFL using the partial correlation coefficient, the most significant correlation of these parameters was found in segments 5 and 8.…”

“…With a normal visual field tested by the fast threshold glaucoma program (nasal to 50, temporal to 22 degrees), distal nasal periphery visual field changes were found in the entire cohort. 14 …”