Doc, Can You Straighten My Eyes ? IV

Squints are estimated to affect 1% of the population. After excluding any underlying conditions such as cataract and refractive errors, most patients wish to have their squints corrected. The benefits of squint surgery include:

• improved appearance and eye positions
• better eye co-ordination so that the eyes can be used simultaneously 
• improved eye movement

While complicated squints are sometimes seen (as in the previous blog), most squints are fortunately straight forward and involves the horizontal muscles. Therefore, most operations will involve operating on a pair of muscles i.e. one is weakened and the other strengthened to make the eye straighter.

  

A child with a left convergent squint (eye turning inward) 

before and three days after squint surgery.

A man with a paralysed left convergent squint before 

and one month after correction.

A child with a severe left convergent squint, before and two months 

after the surgery. Three muscles were operated in this case: 

two on the left and one on the right.

A man with a left divergent squint (eye turning out). He had had previous 

surgery as a teenage in another centre but the eye remained deviated. 

The left eye was re-operated to straighten the eye.

A patient with constant divergent squint. Pictures showing 

before and one month after correction. 

A girl with intermittent exotropia (divergent squint) since young 

which progressed to constant exotropia. Pictures showing 

before and two months after the operation. 

Doc, Can You Straighten My Eyes? III

This middle-aged woman with a past history of hyperthyroidism presented with severe thyroid eye disease. Both eyeballs were constantly depressed due to fibrosis of the inferior rectus muscles (the muscles that are responsible for moving the eyes downwards). And she had severe dry eyes due to eyelid retractions.

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Severe thyroid eye disease with both eyeballs being pulled 

download and lid retractions.

Inability to look up due to severe contracture 

of the inferior rectus.

The depressed eyeballs were corrected by releasing the inferior rectus muscles. Following the squint correction, she was able to see straight without having to constantly elevate her heads. The lid retractions were corrected with botox injection to the levator muscles.

Photos showing steps of inferior rectus recession. a. The eyeball was pulled 

upward using a 4/0 silk passed through inferior limbus; b. the inferior rectus 

was isolated using squint hook; c. the inferior rectus was released and 

d. hang back 4mm from its insertion.

Two days postoperative showing better eyeball position and 

reduced lid retraction.

8 units of Botox was injected into the levator via a posterior approach.

Appearance of the eyes 6 days postoperative.

Appearance of the eyes at two-month post-operative. There were some eyelid 

retraction. Mullerectomy was recommended but patient was happy to leave as 

the eyes were now comfortable. 

Doc, Can You Straighten My Eye? II

The eyes are the centre of attention during face-to-face interaction. Therefore, any imperfection of the eye like squints are immediately apparent. Squint affects about 1% of the population and can adversely affect other people's perception of the person. These two young persons were bothered by their squinting eyes since young but did not seek treatment until now. As they also narrow eyelid opening, double eyelid surgery was combined with the squint surgery. The operations were performed under general anaesthesia.

Right in-turning eye and narrow palpebral aperture (right more than left). 

The in-turning eye was corrected and double eyelids created simultaneously. 

The picture was taken 2 weeks after the operations. The patient had a

mild right ptosis as noted before the surgery.

Another person with left out-turning eye. Correction of the squint was done with 

double eyelid surgery at the same setting. The postoperative picture 

was taken 2 months later.

Doc, Can You Straighten My Eye? I

This middle-aged woman was involved in a road traffic accident 3 years ago resulting in trauma to the left eye. She underwent removal of the lens and blood from the back of the eye. The left eye had poor vision of hand movement and she was very much bothered by the position of the left eye which is constantly inward turning (convergent squint or esotropia). Squint surgery was performed by operating on the horizontal muscles that move the eye. The operation was done under local anaesthesia (using peribular and subtenon anaesthesia) with sedation. 

Left eye turning in caused by trauma.

Close-up view showing malpositioned pupil and absent lens. 

The macula is also damaged.

The muscles of the left eye were operated on to straighten the eyes. In this patient,

the medial rectus was moved back 7 mm and 8 mm of muscle was excised from the

lateral rectus.

The appearance of the left eye at one-day post-oprative. 

The left eye had been straightened.

Doc, Could You Balance My Eyes?

This 60 year-old woman presented with dermatochalasis (excess eyelid skin) and asymmetrical eyelids with the right eye appearing smaller. She sustained a right lateral eyelid trauma in a trauma one year ago. Unfortunately, the wound was not well reconstructed resulting in contracture with pulling of the upper eyelid skin over the lateral canthus. (See picture 1 and 2).

Figure 1. Excess skin in both upper eyelids and the right eye appears smaller 

due to wound contracture (red arrow) pulling down the upper lid (black arrow).

Figure 2. The scars (red arrows) are better seen the upper eyelid is lifted. 

She wanted her eyes to be made symmetrical and brighter. Bilateral upper blepharoplasty were performed together with reconstruction of the scars. The steps performed were shown in Figure 3.

Figure 3. a. Before the operation; b. Marking was done of the excess upper eyelid to be excised 

and a V-Y plasty planned for the contracted scar; c, d, e and f showing the construction 

of the V-Y plasty. g. At the end of the surgery. 

Figure 4. Appearance of the eye at 10 days postoperative.

Figure 5. Appearance of the lateral aspect of the eyelid at 10 days postoperative. 

10mg of triamcinolone and 4 units of botox was given over the lateral region of 

the eyelid at 5 days postoperative to prevent wound contracture.

Figure 6. Appearance of the eyelid at 4 weeks postoperative.

Figure 6. Appearance fo the eyelid at 4 weeks postoperative.