ABSTRACT
Today, contact lenses have extensive usages. Contact lens places on cornea, so it may induce variation on cornea and these variations can influence the measurement of intraocular pressure [IOP] by Goldman tonometer. The aim of this research was to study the effect of various contact lenses on measurement of intraocular pressure by Goldman tonometer. In this study, 80 subjects aged 18-25 were selected randomly among patients of Al-Zahra ophthalmology center. None of them has any eye pathological problems. Before wearing the lens, intraocular pressure was measured, and then patients were divided into two groups of soft and hard contact lenses. Soft and hard contact lenses were placed on the eye for two hours, and the intraocular pressure was measured again. The mean of IOP before wearing contact lenses and two hours later was 15.96 mmHg and 13.93, s respectively. Paired test showed a significant difference between IOP before and after wearing contact lenses [p=0.001].There was no significant differences in mean of intraocular pressure decline before and after placing the contact lens in both soft and hard lenses. According to this study, the intraocular pressure decreases after wearing contact lenses [CL]. This decline may be due to variation in properties of cornea after wearing CL that can also affect IOP measurement
ABSTRACT
Regarding the high outbreak rate of the eye disorders and problems particularly accommodation disorders and convergence insufficiency in computer users, the study tries to determine the convergence, accommodation system, condition, fusion reserves and vision dimension in bank employees [who work with computers] and the control group [who are not computer users] and then to compare the mentioned parameters in the two groups. In this cross-sectional and observational study a total of 44 bank employees and 44 people as the control group members were selected randomly. Initially, refractive problems were reformed, and then accommodation, convergence and vision dimension evaluative tests were conducted. The test included measuring the near point of convergence, jump convergence, phoria, accommodation range [one eye, both eyes], ease of accommodation [one eye, both eyes], positive and negative related accommodation, near fusion versions and TNO. Our results showed that there was a not significant difference among the near point of convergence, jump convergence, near phoria, accommodation range [one eye and both eyes], ease of accommodation [one eye, both eyes], positive and negative related accommodation in bank employees and control group. Regarding the studies, the outbreak rate of accommodation and convergence disorders is higher in bank employees than the control group which would be due to over working with computer within a fixed interval