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For devices used in extremely short distance, it is not easy to enjoy long hours because of various reasons.

March 29, 2016


Self-diagnosis before using VR device within extremely short distance

(To figure out accurate condition of eyes, it requires to check eye disease and vision test at ophthalmic clinic, or vision test at optician's store.)


Self-diagnosis before using VR device within extremely short distance

(To figure out accurate condition of eyes, it requires to check eye disease and vision test at ophthalmic clinic, or vision test at optician's store.)


* Possible main complaints: Symptom occurrence period, and frequency, type, degree of occurrence, and position and direction, direct effect on users 



1) Vision deterioration


If eyesight deterioration, blurred distance vision or near vision are major inconveniences, you have to know when these problems are caused. If eyesight deterioration occurred gradually over the several months, this is refractive error, and for rapid eyesight deterioration in short period of time, it could result in a serious result.


2) Headache


For users who mostly complain headache, detailed inspection needs to be conducted to find out characteristics of headache. Most of headaches have no actual relations with eyes. Doctor's treatment is required if abnormality of brain and others are found through eye inspection. And even for suspicious other headache, medical examination must be taken sufficiently. There are many types of headaches. Such medical examination should include location of headache, degree, frequency, duration, how the pain feels, when headache disappears, and others.



[Headache while using VR]


Eye strain headache is a symptom shown due to uncorrected refractive error or insufficient correction refractive error, such as farsightedness, As.H.(hypermetropic astigmatism), anisopia, unbalanced binocular dysfunction, aniseikonia, and others. In this case, headache occurrence time has something to do with use of eyes. 


The symptom generally shows between 15~30 minutes. When stopping UR use, part or whole of headache disappears. Eye strain headache occurs during short distance operation or VR use, especially long hours of use.


* Reference: Since headache can occur in relation to blood vessel, and especially with migraine and severe headache, it must be identified through medical examination. As specific food or drug can be the cause of such headaches, users must be aware of them and avoid.



3) Flaring, poking, lacrimation


These symptoms are caused mostly by insufficient tear film, not by special ophthalmologic disease, or stimulations due to drugs and chemicals. Causes include low eye blinking frequency in extremely short distance while using VR, and insufficient tears and mucus creation, which can be commonly seen from the middle-aged and elderly or patients who had Lasik eye surgery, Lasek eye surgery (vision correction operation). The causes of scheroma include congenital anomaly regardless of age, Stevens-johnson syndrome, pemphigoid, which is excessive mucus production, Soger's syndrome, which is the secondary abnormality occurred due to aqueous humor abnormality, and others. There are other causes such as meibomian glands dysfunction, or lagophthalmos. 


Unlike scheroma, there are occasions of excessive illacrimation especially in the elderly, and at times, it is shown as the secondary lesion of scheroma. Epiphora is caused by foreign substance of cornea, fretum and imperforation of tear secretory organ, and others. 


These symptoms are stimulated during VR use, due to light spread, glaring, and others, and leads to blurry view.


4) Diplopia


For complaint of diplopia (double vision), remained diplopia should be verified by closing one eye. If disappeared by closing one eye, it is a binocular dysfunction, and accordingly extraocular muscle and binocular function examinations must follow. If diplopia remains even with one eye closed, it can be regarded as optical dysfunction of one eye. And for any kind of diplopia, occurrence time and the direction that diplopia is indicated toward should be identified.


5) External infection or tumor


Accompanied by various symptoms, itchiness, eyelid sticking at waking up, eye inconvenience, feeling of irritation, and others are involved. And time of symptom occurrence and inconvenience, transition of symptom, wide angle existence, and others should be included. Hyperemia is shown as various problems, and as one of diseases such as bacterial eye inflammation, herpetic disease, Reiter's syndrome, Stevens-johnson syndrome. 


6) Flash and floating


Many users feel some stuff floating in front of eyes at early age, and as getting older, this symptom is highly likely to develop into severe stage. This was resulted in hyaline bodies degeneration, in other words, liquefaction phenomenon. If a user complaints this symptom all of sudden, immediate diagnosis should be taken. Upon occurrence of hyaline bodies back side separation, this liquefaction phenomenon leads to flash or photopsia due to the separation. Such flash phenomenon shows occasionally or each time hyaline bodies is pulled from retina, and for occurrences of sudden floating or flash, or visual field defect, it can be an indication of serious disease such as retinal detachment.


Besides hardware problems while using VR within extremely short distance because of various symptoms, and for IT devices enabling to see within extremely short distance with physiology, ophthalmology, ophthalmic optics, and others, developing devices and lens for user's eyes is of most importance.   



As users' eyes are all different depending on race, age, and gender, virtual reality unfolding in front of eyes are created by VR dedicated lens.


Reason for dizziness and for not being able to see for long hours, due to eye strain, refractive error, accommodative dysfunction, heterophoria, and others, is that all users have differences in their eyes. 




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