OCULAR MYIASIS 



1627 



AnthomyidcB : — 



Fannia scalaris Meigen. 

 Fannia canicularis Linnaeus. 

 Fannia incisurata Zett. 

 HydrotcBa meteorica Linnaeus. 



SyrphidcB : — 



Syyphus, sp/? 



(EstridcB : — 



(Estrus oris Linnaeus, 1761. 



Symptomatology. — If lodged in the external auditory meatus, 

 they may simply cause deafness and ringing in the ears, but if 

 eating into the middle ear they may give rise to a discharge of blood 

 and pus. 



Treatment. — It is usual to drop into the ear warm olive or carbolic 

 oil, and then to syringe out the larvae by means of boric lotion. If 

 the larvae are outside the tympanum, inject a few drops of chloroform 

 dissolved in water. 



Prophylaxis. — Some protection such as wool is necessary when 

 suffering from an aural discharge. 



OCULAR MYIASIS. 



Definition.- — Ocular myiasis is the invasion of the spaces under 

 the eyelids, the lachrymal sac, the subconjunctival tissue, or the 

 eyeball itself, by dipterous larvae usually belonging to the families 

 Sarcophagidae or (Estridae. 



Historical.- — In 1905 Kayser studied this form of myiasis and 

 Portschinsky in 1913 reported some cases. Malgahaes has investi- 

 gated this disease in Brazil. In 191 3 Griinberg found a larva 

 of a species of hypoderma in the anterior chamber of the eye 

 of a girl. 



iffiltiology. — The larvae so far recognized as causing this form of 

 myiasis are : — 



SarcophagidcB : — 



Wohlfartia magnifica (Schiner, 1862). 

 Necrobia, sp. ? 



CEstridca : — 



(Estrus ovis Linnaeus, 1761. 



Dermatobia cyaniventris Macquart, 1843. 



Hypoderma, sp. ? 



Symptomatology. — This varies from the discovery of a larva lying 

 like a foreign body under the eyelid, to infection of the lachrymal 

 sacs or the tissue under the palpebral or ocular conjunctiva, to the 

 total destruction of the eyeball. 



Treatment. — This consists of the prompt removal of the larva by 

 surgical means. 



